According to the history books, Li Chengqian, the eldest king of Hengshan, was the most favored and most valued son of Li Shimin, Taizong of the Tang Dynasty.

When Li Chengqian was 3 years old, Tang Taizong Li Shimin asked the nephew of Empress Changsun Jiaqing to serve as his attendant, and when Chengqian was 5 years old, Tang Taizong Li Shimin asked Lu Deming and Kong Yingda, the two eighteen scholars of the Qin Palace, to teach his son Confucian classics. Not long after Tang Taizong Li Shimin ascended the throne, he made Li Chengqian, who was only 8 years old, the crown prince. Since the fourth year of Zhenguan, Li Shimin, Taizong of the Tang Dynasty, began to let Li Chengqian handle the affairs of the DPRK and the Central People's Republic of China, as well as take on the heavy responsibility of supervising the country when he was in mourning or leaving Beijing.

After Li Chengqian fell ill, Li Shimin, Taizong of the Tang Dynasty, who did not believe in Buddhism or Taoism, issued an order to invite the Tianzhu monk Bopo and the Taoist priest Qin Ying to pray for his son. After Chengqian's illness recovered, Tang Taizong Li Shimin was overjoyed to give 60 pieces of silk and other 60 pieces and 10 bodies of timely service to Bopo, and summoned 3,000 people to become monks, and specially built Xihuaguan and Puguang Temple, and also relieved the prisoners in the prison of their crimes, so as to pray for Chengqian.

In order not to make his son work too hard, Tang Taizong Li Shimin specially allowed Chengqian not to study more, as long as he commented on ancient things with Kong Yingda. However, Li Chengqian did not take the opportunity to indulge himself, but showed more outstanding ability to govern the country and the country, once Tang Taizong Li Shimin asked him to try to write a strategy for governing the country, as a result, he quickly wrote three pages, the content is very valuable, Tang Taizong Li Shimin read it very proudly to show off to the courtiers and said: "First of all, the prison is the most important, and it is very important to the state." ”

In the 8th year of Zhenguan, Li Chengqian added yuan to serve, and Li Shimin, Taizong of the Tang Dynasty, thus granted amnesty to the death penalty below, and gave the son above five grades as the father of the latter knighthood. In the 9th year of Zhenguan, Li Chengqian married the eldest daughter of the secretary Cheng Su as the crown princess, and Li Shimin, Taizong of the Tang Dynasty, feasted the ministers for this, and gave the silk differently, and the all-night banquet was even admonished by Chu Suiliang. In the 12th year of Zhenguan, Li Chengqian's eldest son Li Xiang was born, because of the joy of the birth of the emperor's grandson, Tang Taizong Li Shimin ordered the world to see the prisoners to be punished by the first class, and the son of the five grades of internal and external official ministries was the father and the descendant, and each of them added a medal to the officer, and the world was drunk for five days, and the feast was more than five grades in the East Palace.

In the 13th year of Zhenguan, Li Shimin, Taizong of the Tang Dynasty, set up the Prince Academy for Li Chengqian in the East Palace-Chongwen Museum, and it was not taboo that Chengqian might take this opportunity to cultivate private forces that threatened the emperor's position. In the 15th year of Zhenguan, Li Shimin, Taizong of the Tang Dynasty, in order to consolidate the position of the crown prince of Chengqian, ordered the sons and daughters of officials above the third rank to serve in the East Palace, so as to ensure the strong support of the important ministers of the court to the prince. In the 16th year of Zhenguan, Li Shimin, Taizong of the Tang Dynasty, issued an edict ordering the crown prince to use no upper limit on the treasury.

But at this time, Li Chengqian began to become rebellious as he grew older and suffered from foot disease, but because he was dissatisfied with his father, he dared to be willful and bold enough not to go to court for several months, and Tang Taizong Li Shimin not only did not have any accusations and criticisms for this, but also specially appointed Wei Zheng as the prince and prince, intending to tell everyone that he would never abolish the prince.

Even if Li Chengqian later committed such a heinous crime as rebellion, Tang Taizong Li Shimin was unwilling to kill this son, and no one in the court dared to say that the prince should be beheaded according to the law if he rebelled. In the end, he still gave people to help him and said: "Your Majesty is a loving father, and the prince will be good if he has to live his life." This was in line with the mind of Li Shimin, Taizong of the Tang Dynasty, and in the end, all the accomplices in the rebellion case were given to death, but Li Chengqian, who was the main culprit, saved his life and was only deposed as a concubine. Laiji was also valued by Li Shimin, Taizong of the Tang Dynasty, and his official position was constantly promoted, and he soon became an examiner and a foreign officer, and the following year he was promoted to the Zhongshu Sheren, and co-wrote the "Book of Jin" with Linghu Dedi and others.

Although Li Chengqian was deposed, for the sake of his son's future safety, Li Shimin, Taizong of the Tang Dynasty, used the words "Taili, Chengqian, and King Jin do not exist; The king of Jin was established, and the Tai Communist Party Chengqian was unharmed", and decisively set up the young but mild-mannered Li Zhi as the crown prince, with the purpose of being able to keep the three beloved sons of Chengqian, Li Tai, and Li Zhi at the same time.

In December of the 18th year of Zhenguan, Li Chengqian died of illness, and Li Shimin, Taizong of the Tang Dynasty, abolished the dynasty and buried him with a national ceremony.

According to historical records, Li Tai, the second king of Pu, was the most favored son of Li Shimin, Taizong of the Tang Dynasty, and all kinds of favored deeds abound in the history books.

In the 3rd year of Wude, Li Tai was named the king of Yidu as soon as he was born, and the following year he was named the king of Wei and Shangzhu of Zhengyipin. In the 2nd year of Zhenguan, Li Tai changed the title of King of Yue, and was named the Governor of Yangzhou and the Governor of Yuezhou, with a fief of 22 states. In addition to the title of governor, Li Tai is also the general of Yongzhou Mu and Zuo Wuhou (this is a special favor unique to Li Tai during the Zhenguan period, except for Li Tai, only Li Zhi has such treatment - Li Zhi is also the general of Youwu Hou in addition to the title of governor).

In the 7th year of Zhenguan, Li Ke, who was the same age as Li Tai, went to the fief as usual, and Li Shimin, Taizong of the Tang Dynasty, not only did not let Li Tai go to the fief for a long time, but even issued an edict to let Li Tai move into the Wude Hall to live, which was stopped by Wei Zheng. However, Tang Taizong Li Shimin's various outrageous actions because he loved his son did not stop because of the ministers' strong persuasion.

Once Li Tai complained to his father that those ministers above the third rank in the court did not respect him enough, but when Tang Taizong Li Shimin heard that his beloved son had been wronged, he didn't say a word under the thunder and anger, and immediately summoned those ministers into the palace to question him sternly. Fang Xuanling and the others were so frightened that they didn't dare to speak, only Wei Zheng stiffened his neck and argued. In the end, Tang Taizong Li Shimin admitted that he forgot his public because of his personal love for Li Tai, but afterwards, the favor of this green finch was still how to come or how to come, and the ministers were helpless.

According to the records of the historical books, Li Tai "has a big waist and abdomen", but when Tang Taizong Li Shimin saw his beloved son so round, he was worried that it would not affect his figure if he was too fat, but that his son would be very hard when he went to the court to worship like this, and he was specially allowed to take a small sedan chair to the court in distress. And because Li Tai loves literature, Tang Taizong Li Shimin specially ordered to set up a literature museum in the Wei Palace, and let him recruit bachelors. As for the famous Furong Garden, and the mansion in the eastern capital Luoyang, which occupies a square of Huixunfang, they were all given to his baby son by Li Shimin, Taizong of the Tang Dynasty, and the Wei Wang Pond and Wei Wang Causeway built by Li Tai in the capital of Luoyang are also famous all over the world.

In the 14th year of Zhenguan, Tang Taizong Li Shimin visited Li Tai's mansion in Yankangfang, Chang'an, and thus specially pardoned the criminals below the capital crime in Yongzhou and Chang'an, and exempted the people of Yankangfang from renting for one year, and rewarded the officials of the Wei Wangfu and the old people who lived in the same square a lot of things. Speaking of Li Tai's mansion, long before he officially moved in, he was admonished by Cen Wenwen because of the Sheng Xiu mansion. And Tang Taizong Li Shimin still praised and rewarded Cen Wenwen, but he did not see any displeasure and restraint for Li Tai's behavior.

In the 15th year of Zhenguan, the "Chronicles of the Universe" edited by Li Tai was completed, and Li Shimin, Taizong of the Tang Dynasty, was very happy, such as a treasure, not only collected this work into the royal library, but also rewarded Li Tai one after another - first gave "ten thousand paragraphs", and then rewarded a large amount of property every month, the amount even exceeded the prince's specifications, which provoked Chu Suiliang to have to go up and advise. As a result, Tang Taizong Li Shimin happily agreed with his views, but did not reduce Li Tai's expenses because of this, but canceled the prince's spending restrictions, which was tantamount to maintaining Li Tai's expenses in disguise.

Tang Taizong Li Shimin not only doted on Li Tai in every way, but often took him around to travel around, not to mention, and even if he couldn't see him for a short day, he had to send a white falcon named "General" that he raised to deliver letters, and so many times in one day. Even Li Tai's eldest son was "especially loved by Tang Taizong Li Shimin" because of his father, and was particularly favored by Tang Taizong Li Shimin, and was taken into the palace to raise him at the age of four, and was given the name "Xin".

In the 17th year of Zhenguan, the crown prince Li Chengqian was deposed, and Li Tai took the opportunity to coquettish his father, claiming that he would kill his son and pass the throne to his younger brother Li Zhi after a hundred years. And Tang Taizong Li Shimin saw the round green sparrow thrown into his arms, and his heart immediately softened, and when he heard such a guarantee, he even promised to make him the prince. However, such a lie was ruthlessly exposed by Chu Suiliang, and Tang Taizong Li Shimin calmed down and understood that it was impossible to kill his son, so in order to ensure that his three beloved sons could survive at the same time, he decisively set up Li Zhi as the crown prince.

Although he had to belittle Li Tai, Tang Taizong Li Shimin still said in the edict: "Li Tai, the king of Wei, is my very beloved son, and I really love this son." This son was very smart and clever when he was young, and he was very fond of literature, and my love for him was so unusual...... "Less than four years after Li Tai was demoted, Li Shimin, Taizong of the Tang Dynasty, re-enshrined him as King Pu. Not only that, Tang Taizong Li Shimin also took Li Tai's top table and said to the ministers around him: "Thai is beautiful, isn't he a talent, how much I remember him in my heart, you also know." But they can only endure the pain and cut their love, which is also the way to protect the three brothers. ”

Li Tai himself is talented, and history records him as "brilliant", because he is not only very proficient in literature, but also has as many books as the royal family's library, and he also writes brilliantly in cursive and cursive, and is also quite good at appreciating calligraphy and painting. According to the records of Zhang Yanyuan in the Tang Dynasty in the "Records of Famous Paintings of the Past Dynasties", Li Tai had two calligraphy and painting appreciation seals, which were divided into two seals of "turtle" and "benefit", and King Mu of Zhou's "Eight Horses" was also handed down because of Li Tai.

The "Chronicles of the Geographical Areas" edited by Li Tai preserved many precious materials in the geography books of the Six Dynasties, which had a profound impact on later generations, and the new genre of geography books created also set a precedent for the style of the general chronicles of the Tang and Song dynasties.

According to historical records, Li Zhi, the third emperor of Tang Gaozong, was the most doting son of Li Shimin, Taizong of the Tang Dynasty.

As soon as Li Zhi was born, Li Shimin, Taizong of the Tang Dynasty, ordered that anyone born on this day could get food, and then feasted on ministers above five grades. It is even said that three days after Li Zhi's birth, when the "Three Dynasties" were washed, Empress Changsun gave this youngest son the jade dragon child that her husband had obtained from the Jinyang Palace and the swaddling clothes decorated with pearls. Since then, this jade dragon that is "not a few inches wide, but gentle and exquisite, not owned by the world" has become the mascot of the Tang Dynasty and has been passed down from generation to generation by the emperors.

In the 5th year of Zhenguan, Li Zhi was named the king of Jin, and in the 7th year of Zhenguan, Li Shimin, Taizong of the Tang Dynasty, gave the land of Longxing of the Li Tang Dynasty and the Jinyang Mansion of the state to this younger son. And Li Zhi also lived up to his father's love, he was very smart since he was a child, and he was also very filial to his parents.

Zhenguan ten years in June, the eldest grandson queen collapsed in the Lizheng Palace, only seven years old Li Zhi has since lost his mother, but fortunately, Tang Taizong Li Shimin made up for this most beloved little son with double the father's love, he did not let Li Zhi out of the palace or live alone somewhere in the palace because of the death of his wife, but left Li Zhi's brothers and sisters in his own palace to take care of them, and looking at the entire Tang Dynasty, the emperor personally raised the prince only Li Zhi alone, what kind of affectionate love and honor this is!

However, Tang Taizong Li Shimin's preference for this youngest son did not stop there. In the case that Li Zhi had already been sent to the governor of the state, Li Shimin, Taizong of the Tang Dynasty, crowned him as the general of the right military candidate. In the 16th year of Zhenguan, Li Zhi went directly to the court to participate in political affairs without even going to his fiefdom. In this regard, the history books especially used the words "special favor" to describe Tang Taizong Li Shimin's doting on Li Zhi.

In the 17th year of Zhenguan, the crown prince Li Chengqian was deposed, and in order to keep the three beloved sons of Chengqian, Li Tai and Li Zhi at the same time, Li Shimin, Taizong of the Tang Dynasty, decisively established Li Zhi as the crown prince. After Li Zhi was made the crown prince, Tang Taizong Li Shimin's favor for Li Zhi remained the same, and it can even be said that it was even more than before. Li Zhi's eldest son Li Zhong was born, although he was only a concubine, but Tang Taizong Li Shimin was still very happy, not only at the banquet "drunk and dancing" and "stop all day", but also against the system that the emperor and grandson can only be crowned the king of the county, and made an exception to canonize Li Zhong as a prince.

And Tang Taizong Li Shimin has been placing his baby son on the side of his dormitory, although Li Zhi has a Jin Wang Mansion outside the palace, but even after Li Zhi was established as the crown prince, Tang Taizong Li Shimin did not let him live out of the palace or live in the East Palace according to the system. It was not until the eighteenth year of Zhenguan that Liu Xun wrote a book, and Li Shimin, Taizong of the Tang Dynasty, ordered Liu Xun and Cen Wenwen to take turns with Ma Zhou to go to the East Palace every day to discuss with the crown prince. The result did not last long, Tang Taizong Li Shimin let his son return to his side, and Chu Suiliang couldn't help but read in the twenty years of Zhenguan, Tang Taizong Li Shimin agreed to let Li Zhi live in the East Palace for half of the month, and stay by his side for half of the time.

In the 19th year of Zhenguan, Tang Taizong Li Shimin personally conquered Goguryeo, and Li Zhi stayed in the rear as the crown prince. Li Zhi, who has been with his father day and night since he was a child, was very reluctant to cry for days, and Li Shimin, Taizong of the Tang Dynasty, said to him: "You have been by my side since childhood, like a baby, I am on this expedition, you can take the opportunity to exercise, why cry?" Li Zhi replied: "My mother died when I was 7 years old, and my father has always taken me with me, getting along day and night, and I have never been separated, and I can't help but feel sad at the thought of us being separated." Tang Taizong Li Shimin also burst into tears when he heard this. So Tang Taizong Li Shimin in order to be able to understand each other's situation in a timely manner, pioneered the flying watch system, and Li Zhi also asked his father to reply immediately after receiving his letter.

Not only that, after Li Zhi heard that Li Shimin, Taizong of the Tang Dynasty, was once no more than 100 steps away from "the thief city" during the war, he was so nervous that "the soul is flying and fighting, and he doesn't know where to be", and hurriedly expressed to his father that "I wish to think about the importance of the sect and take billions of trillions as my heart", telling him not to be so brave in the war, and he is very worried about being a son. So Tang Taizong Li Shimin immediately replied to a letter of "Ke Goguryeo Newspaper to the Crown Prince", saying that since he received his letter, because he thought that his son would be worried, "so he will not hold the axe", and "from now on, he will not personally march in battle, don't be worried." ”

And just before Tang Taizong Li Shimin personally conquered Goguryeo, Li Zhi was sent all the way to Dingzhou. Until he couldn't give it anymore, in the face of his reluctant beloved son, Tang Taizong Li Shimin pointed to the clothes on his body and said: "Until our father and son meet again, I will never change this clothes." Therefore, Tang Taizong Li Shimin's clothes were dirty and worn, and even the minister couldn't stand it and persuaded him to change it, but he refused to agree. Later, Tang Taizong Li Shimin heard that Li Zhi was on the way to meet him, so he couldn't wait to lead three thousand guards to rush into Linyu Pass, and happened to meet Li Zhi on the way.

When Tang Taizong Li Shimin returned from the Liao expedition and prepared to tour Lingzhou, he planned to take Li Zhi with him, but Zhang Xingcheng said: "The minister heard that the crown prince is going to accompany His Majesty to Lingzhou, but the minister thinks that instead of His Majesty letting the prince accompany him to Lingzhou because of his personal love, it is better to let the prince stay in charge of the country at this time, receive hundreds of officials to discuss the government and decide on all matters, and be familiar with the affairs of the court, so as to not only stabilize the capital and town, but also show the prince's holy virtue to the Quartet." Tang Taizong Li Shimin thought that what he said was reasonable, so he crowned him as the Yinqing Guanglu doctor from the third grade.

In the 23rd year of Zhenguan, Tang Taizong Li Shimin died, and Li Zhi ascended the throne as Emperor Gaozong. During his reign of 34 years, the living standards of the people continued to improve and the population continued to grow. The territory of the Tang Dynasty was also expanded to the maximum, not only for the northwest and Haidong troops were very fruitful, but also basically put down the Turkic rebellion, even if the battle against Tibet failed, but in the late period it has basically stabilized the situation against Tibet.