On this day, Foreign Minister Tang Fei came to the East Palace and reported to the crown prince Li Suyu that the Persian king Isae III had come to Chang'an and asked to see His Royal Highness the crown prince.

Li Su consulted the information and studied what was going on with the Persian king Isiai III. He consulted a lot of relevant information and suddenly found a problem that surprised him.

Historically, the territory of the Tang Dynasty in its heyday was about 16 million square kilometers, and the territory reached the Aral Sea in the northwest, directly bordering today's Iran, called Longyou Dao; To the north, it reaches Lake Baikal, which is the Chita region of today's Russia, called Kannai-do; The southern part includes all of Vietnam and is called Lingnan Province; To the northeast, as far as the Zhugzhur Mountains of present-day Russia (including Sakhalin Island), it is called Hebei Province.

The Battle of Hengros was a decisive battle between the Tang Dynasty and the Arab Empire (Great Food Empire) during the Tang Xuanzong period. It happened in Hengros and lasted about five days, and finally Datang failed.

After this battle, the Tang Dynasty gradually lost the Western Regions. And then the successive reactions led to the fact that China has been in recession since then. It can be said that the Battle of Hengros was a world-class war of great importance for Chinese history, and it was also a turning point in the rise and fall.

Originally, the Arab Empire and the Tang Dynasty did not border. After the Arab Empire destroyed the Persian Empire, it defeated the Dayue Clan and bordered the Anxi Protectorate of the Tang Dynasty. Later, due to the conflict of interests between the Tang Dynasty and the Arab Empire, the Battle of Hengros took place.

At this time, the strength of the Arab Empire and the Persian Empire was basically equal. After the Arab Empire destroyed Persia, it posed a threat to the Tang Empire.

After 638, the Persian king Iziai III twice sent envoys to Chang'an to ask Li Shimin for help. However, Li Shimin believed that there was still a Dayue clan between the Persian Empire and the Tang Dynasty, which was too far away from the Tang Dynasty, and he was too lazy to care about the affairs between them, and missed a good opportunity to contain the Arab Empire.

Li Su thought at this time that the Arab Empire and the Persian Empire were better off maintaining the status quo. Let them fight against each other and contain each other. Just like Tubo and Tuyuhun, this is more beneficial to the development of Datang.

In order to find out the current state of the Persian Empire, Li decided to meet with the Persian king Isael III.

East Palace, reception room.

Li Su, Cen Wenwen, Tang Fei, and Xiao Tie met with Yi Si Ai III.

The appearance and characteristics of Iziai III were similar to those of the current Iranians. He is 24 years old, of medium build, handsome in appearance, and looks a little weak.

Isiai III looked a little tired, not in a very good mental state, and seemed to be preoccupied and stressed.

Before coming to Chang'an, Yi Si Yi III had carefully understood the situation in the Tang Dynasty and knew that the current crown prince had a high prestige in the Tang Dynasty. With the idea of giving it a try, he came directly to the crown prince Li Su.

After Ixae III explained his intentions, Li Su said: "Your Majesty, the Tang Dynasty and Persia are friendly neighbors. As for the difficulties encountered by the Persian Empire, we will certainly help if we can. ”

When the Persian king Isiai III heard that Li Su's tone was completely different from Li Shimin's, he suddenly felt hopeful. He gave a detailed account of the current state of the Persian Empire.

The Sassanid Empire of Persia was the last pre-Islamic Persian Empire, which began in 224 AD, and the territory of the Sassanid Empire included present-day Iran, Afghanistan, Iraq, Syria, the Caucasus, southwestern Central Asia, parts of Turkey, parts of the Arabian Peninsula coast, the Persian Gulf, southwestern Pakistan, and even extended to India. It has a land area of about 5.6 million square kilometers and a population of 19.7 million (620 years).

Such a powerful empire quickly collapsed due to sudden changes.

In 630, his father was assassinated, and at the age of 13, he ascended to the throne, placing power in the hands of his ministers, and the empire went downhill.

In 637, under the leadership of Caliph Omar ibn Khattab, the Arabs defeated the Persian army led by Rustam Farohzadeh at the Battle of Qadisiyah and laid siege to the Persian capital Ctesiphon.

After a long siege of Ctesiphon fell, Ixae III abandoned a great deal of treasure and fled eastward, leaving the Sassanid government short of finances and unable to use its vast financial resources.

Some Sassanid officials attempted to rally forces to resist the invaders, but they were defeated at the Battle of Nahavand due to the lack of a strong central authority. With the military chain of command in name only, financial resources destroyed, and the Azadan knighthood destroyed one by one, the Sassanids were powerless to deal with the invaders.

By now, almost half of the Persian Empire has been lost. Unable to resist the invasion of the Great Food Empire, Isiai III came to the Tang Dynasty for help.

Yi Si Ai III came to the Tang Dynasty this time and came prepared. He heard that the prince of the Tang Dynasty, Li Su, had married the princesses of the Tiele and Tuli tribes and helped them through the difficulties. He was now very poor and had no courtesy, so he took his 16-year-old sister, Princess Narkith (Narcissus), and prepared to sacrifice it to Li Su.

After figuring out the situation in the Persian Empire, Li Su said to the Persian king: "Your Majesty, we have deep sympathy for what has happened to your country. Please go back to the hotel and rest, and we'll discuss. Then give you a reply. ”

After Isia III left, Cen Wen asked, "Your Highness, do you really want to help the Persian Empire?" ”

Li Su said: "Well, you must help." It would be beneficial for the Tang Dynasty to keep the Persian Empire and let them fight against the Arab Empire. ”

Tang Fei said: "However, our Tang Dynasty is now at war with Goguryeo, I'm afraid we don't have the strength to help them, right?" ”

Li Su said: "There is no hurry in this matter. Anyway, the Persian Empire will not be wiped out for three years and five years. We can wait until the war in Goguryeo is over, and then we can help them. ”

Tang Fei asked, "Then what should our Ministry of Foreign Affairs do?" ”

Li Su said: "Don't do anything, treat them with delicious food and drink." ”

Tang Fei smiled and said, "Your Highness, the sister of the King of Persia, that Narcissus Princess, what are you going to do?" ”

Li Su asked curiously, "Lord Tang, how does that Narcissus princess look?" ”

Tang Fei said: "Princess Narcissus wore a veil, and the minister didn't see her face. ”

Li Su: "Then forget it." I am not religious, and I have a lot of inconveniences with her. Besides, I'm afraid her Chinese language skills are not high. If I marry her, will I have to put a translator in the cave room? ”

The crowd listened and laughed together.

After Cen Wenwen and the others left, Li Su came to the back house and smiled at the princesses: "Baby, the king of Persia sent his sister Princess Narcissus, you say, do I want it?" ”