As early as after the capture of the central capital, Genghis Khan heard that there was a Yelu Chucai who was very knowledgeable, so he asked several Jin generals from the Jurchen tribe, such as Ugulun, Yin Dahu, and Youhara Badu, and learned that this person was indeed an outstanding talent.

Yelu Chucai's word Jinqing, called Zhanran Jushi, is a descendant of the Khitan nobles, and lives in Qishui. He is the eighth grandson of the eldest son of Liao Taizu Abaoji, Dongdan King Yeluxin, his father Yelulu is erudite and versatile, and he was the deputy prime minister Shangshu Zuocheng when he was in Jin Zhangzong, and the degree of sinicization has been very deep.

Yelu Chucai was born in the first year of the Ming Dynasty of Jin Zhangzong, at this time Yelu was already in the age of the sixtieth year, proficient in mathematics, can read the fortune-telling father said to the relatives: "I am sixty years old and get this son, he will be our family's thousands of miles of horses." I see his countenance, and this boy will become a great man in the future, and he will be used by the king of a foreign land. So he named his son Chu Cai.

This is an allusion to his youngest son named Chu Cai and the word Jin Qing according to the allusion of Chu and Jin in "Zuo Biography", as if he had already seen that the Jin Dynasty would inevitably perish, and his favorite son born in old age would become a famous minister in a foreign country. Chu Cai lost his father at the age of three, and he was taught as a teenager by his mother Yang, whose name was Xingxin, and was a descendant of Yang Jian in the Sui Dynasty.

He was drinking at a friend's place, and after drinking he happened to see a beautiful and well-read girl, and was immediately overwhelmed by her gentle and generous demeanor, so he asked his friend, "Who is this girl?"

The friend sighed and said: "This girl is a descendant of Yang Jian, the emperor of the Sui Dynasty, just because her father was addicted to alcohol and gambling, and the family property was wiped out, in order to pay off the gambling debts, he had to sell his wife and daughter, the wife was unwilling to be sold, jumped to death, and the daughter was brought home by a friend and recognized as a goddaughter." ”

When Yelu heard this, he was very sympathetic to her life experience, and asked her to go home to talk about it, only to know that she had read and read since she was a child, and she was a learned woman, so she was taken in the room as a concubine, and soon gave birth to Yelu Chucai. Yang is also good at playing the piano, Chu Cai has been influenced by the sound of the piano since she was an infant, and she also likes to play the piano and compose music as an adult, and she has won her mother's talent.

When Genghis Khan founded the country and became the emperor, Yelu Chucai was seventeen years old, read everything, and had the spirit of everyone for the text, and when he was twenty-four years old, he was named Kaizhou Tongzhi by King Jin, and his reputation was already very great. At the age of twenty-five, when Jin Xuanzong fled south, the siege of the Mongol army was tight, and Chu Cai's elder brother Zhicai and Shancai fled south with Jin Xuanzong's escort, and he was ordered to stay in Zhongdu, and was selected by Wanyan Chenghui as a member of Shangshu Province.

Yelu Chucai has read a lot of books since he was a child, and is especially proficient in scripture and history, as well as geography, astronomy, legal calendar, mathematics, interpretation of the elderly, and medical divination. In his childhood and youth, he witnessed the great suffering brought to the people by years of war, so during the siege of Zhongdu, he took the initiative to worship the old man Wan Song as his teacher and converted to Buddhism, in an attempt to seek spiritual sustenance from Buddhist theories.

At this time, Yelu Chucai saw that the general trend of the Jin Kingdom had gone, and he felt powerless to return to heaven, and he did not find a way out from Buddhism, so he abandoned his official position and ran away, quietly hid in the depths of the Yanshan forest to live, studied quietly, cultivated himself, and lived a half-peasant and half-hidden life.

After Genghis Khan learned of Yelu Chucai's knowledge and talent, he sent people to search for his whereabouts many times, and only learned of his residence after half a year, and immediately sent two brothers, Otun Shiying and Otun Shibao, to ask for it. After a lot of twists and turns, the two finally found Yelu Chucai's residence, and shouted for a long time, but no one came out to open the door.

The brothers were helpless, so they pushed the door and entered the house, only to see a child sleeping on a bed, and asked him, "Is Yelu Chucai at home?"

When the boy heard this, he did not affirm or deny it, but said, "This is the residence of the Zhan Ran monk, and he has been out for many days. ”

Otun Sebo asked the boy again, "Do you know when the Zhan Ran monk will return?"

The boy replied noncommittally: "At least five or seven days, at most ten days, half a month, the time is not necessarily, sometimes you can spend half a year outside." ”

When the brothers heard this, they were very angry, and they returned unhappily and reported the situation to Genghis Khan. Two days later, Genghis Khan sent his third son, Wokotai, to ask for an edict, and some of the generals present suggested: "A scholar should send troops to arrest him, so why send people to invite him again and again?"

Genghis Khan explained: "It's not right for you to say that, the three armies are easy to get, but the first will be hard to find." What's more, Yelu Chucai has the material of heaven and earth, which is not comparable to ordinary people. ”

Before leaving, Genghis Khan instructed: "You must be courteous and courteous, because he is a modern sage, and he must not be rude in words and deeds, otherwise he will be severely responsible." ”

Wokotai brought a few guards to the door of Yelu Chucai, and came across a bearded man in the garden, watering his greens. When Wokotai saw that no one was beside the bearded man who cared about watering the manure, and did not even glance at him out of the corner of his eye, he did not dare to step forward, but stood outside the fence of the garden and watched.

The bearded man didn't seem to see anyone standing there, but still only cared about watering his dung, and when he poured it on the edge of the fence, he actually raised the dung scoop high, and with a sharp flick, the stinking dung water poured half of the body of the wokotai at once.

At this time, the entourage of Wokotai was about to get angry, and when they saw the three princes waving their hands continuously, signaling them not to speak, they finally held back. Wokotai was about to come forward to talk, but the bearded man dropped the dung scoop, picked up a machete from the ground, and went straight to the forest behind the house to cut wood.

Wokotai had no choice but to endure his temperament and then follow up in the forest, then stepped forward and said respectfully: "Old man, you must be Mr. Yelu Chucai." ”

When the bearded man heard this, he couldn't help laughing: "What kind of old man am I, I am only twenty-five years old this year. ”

Speaking of this, he turned his head to look at the person who came, and said with a smile: "Just now I only cared about watering the dung, I didn't think of sprinkling it on you, I'm really sorry to offend, you are not angry, it makes me feel very guilty, please go to the grass hut and sit down." ”

After saying that, he put down his machete and led Ogedai back to the house, and an attendant took the opportunity to tell him: "This is our third prince, Wokotai, who has come to ask for an edict on the order of the Great Khan." ”

Yelu Chucai turned his head at this time, looked at Wokotai and said, "Third Prince, Great Khan, are you ......?"

Ogedai hurriedly said: "My Khan's father, Genghis Khan, has heard of Mr. Chen's name for a long time, and knows that you have only met people, so he sent me to invite him, and I hope that Mr. will not refuse, and go to Mongolia with me as soon as possible." ”

Yelu Chucai smiled again and said, "Genghis Khan is the emperor immediately, what is the use of asking me to be a scholar?"

"Mr. is knowledgeable and profound, intelligent and intelligent, famous, has lived in the mountains and forests for a long time, such as a pearl hidden, useless in the world, why not go out of the mountain, assist the Great Khan, make meritorious contributions, and not in vain what he has learned in his life. ”

"I am a descendant of the King of Liao, and now I am a deceased minister of the Jin State, I'm afraid it is not appropriate to be a subordinate of the Mongol Great Khan, right?"

One of Ogedei's attendants immediately said: "Our Great Khan has always treated foreign generals equally, and the Great Khan has long been looking forward to seeing you. ”

After repeated persuasion, Yelu Chucai finally followed Ogedai to Mongolia, Genghis Khan was taking summer vacation in Jinlian River, and when he heard that Yelu Chucai was coming, he was very excited and met him in person. When Genghis Khan saw that Chu Cai was only twenty-five years old, but he had a long beard, he was eight feet long, and he spoke loudly, and he was a beautiful bearded man, and his heart was even more happy.

For many years, in front of many Khitans, Genghis Khan has been flexible to dress himself up as the avenger of the Khitans who were destroyed by the Jin Dynasty. This time, when he met with Yelu Chucai, a great talent of the Khitan people and a descendant of the emperor of the Liao State, he did not forget the agitatory point of view he adhered to, and he directly said to Yelu Chucai: "The Liao royal family and the Jin royal family have always been enemies, and I have avenged your Khitans today. ”

"Report to the Great Khan, my grandfather, my father, and myself have already entered the court to serve the king of Jin, and have become servants of the Jin court. Now that I have become a servant of the King of Jin and live on the money given by the King of Jin, if I am hostile to the Jin Dynasty any longer, will I not be guilty of deceit?" replied Yelu Chucai.

After hearing this, Genghis Khan asked: "Since you are loyal to the Jin Dynasty, why did you abandon your official position and go out and retreat to the mountains and forests, and finally did not do your best for the King of Jin?"

Yelu Chucai replied bluntly: "Please Great Khan Mingjian, the current Dajin Dynasty is full of holes, Shou will go to bed, I have no power to return to heaven alone, and I can't betray openly, so I can only secretly retreat and stay away." ”

As we all know, Genghis Khan has always attached great importance to a person's loyalty to the king, even if that person is in the enemy's stronghold. Therefore, Genghis Khan's reply made Genghis Khan very satisfied, and what made him especially happy was that this well-educated man in front of him, who knew astronomy and geography, was burly, with a beard and a solemn and powerful tone, which was awe-inspiring.

On weekdays, Genghis Khan hated the most those who betrayed their lords and were ungrateful, and did not speak of loyalty. Yelu Chucai's idea of loyalty to the monarch was exactly what Genghis Khan wanted to vigorously advocate, and from then on, the two of them often talked about the present and the past together, talked about the world and the earth, and took him with him every time they went on an expedition.

Because of Yelu Chucai's rich knowledge, Genghis Khan knew about every consultation, and his divination was particularly miraculous, so Genghis Khan publicly called him a godsend. In fact, the main reason why Yelu Chucai was valued by Genghis Khan was because he was proficient in the art of ephemeris.

Yelu Chucai relied on astrology and divination to determine good fortune and evil, which was much more profound and mysterious in form than that of shamans burning sheep bones, so he was very trusted by Genghis Khan. Genghis Khan was very affectionate to Yelu Chucai, and never called him by his first name, but called him Wu Tusa reasonably, which means a man with long hair, a man with a long beard, which is exactly what the Chinese word for is beautiful.

Since then, Genghis Khan regarded him as a person who could be very trusted, after he got Yelu Chucai, he was like a fish in water, and sat together all day long to talk about the great plans of the country, and he was very deeded, and the two seemed to have endless words, no matter what questions the Great Khan did not understand, Yelu Chucai could answer endlessly, like a river, and let him understand in simple terms.

Genghis Khan was surprised to come into contact with the civilization of the Central Plains from Yelu Chucai, and gradually learned about the culture of the Central Plains, and this event would have a great impact on the fate of the Mongol Empire, especially on the policy of the Mongol army.