Since the Persian Empire signed a peace agreement with the Arab Empire, Hina returned to the Tang Dynasty without having to cross India, she passed directly through the Persian Empire, went to the Anxi Protectorate, and then returned all the way back to Chang'an.

He was accompanied by a large Arab caravan, led by the caliph's 19th son, Harold.

Along the way, the little prince Harold studied Chinese with his Chinese teacher Durbo, and Sheena checked his study all day long, and constantly threatened him not to let him come to Chang'an City if he didn't learn Chinese well.

Harold was tortured by Sheena, and finally mastered the basic dialogue of Chinese and learned to write simple Chinese characters.

In fact, there is no need for Sheena to urge, Harold will also work hard to learn Chinese.

Harold was the 19th of the caliph's 27 sons, and his mother, like Sheena's mother, was an unfavored concubine. He rarely saw the caliph, so much so that the caliph couldn't even remember his name.

The caliph sometimes summoned his sons to speak, but he was only interested in those sons who were prominent, and the caliph never spoke to his sons like him.

Since he was a child, he envied his older brother or younger brother and hoped to be favored by his father.

Sister Sheena was originally an unappreciated person like herself, but when she became an imperial concubine in the Tang Dynasty and returned to Damascus, even the caliph looked at her differently, and her mother was respected and valued because of this.

Harold, who longed to change his fate, knew that he had nothing to do in Damascus, so he moved the idea of going to Datang.

Sheena and Harold had a close relationship, and she lacked close people in the Far East, so when Harold offered to study in the East, Sheena approached the Caliph and made this request.

The caliph did not agree immediately, he said at the time: "There is no hurry in this matter, anyway, you will not leave Damascus for a while, and when you want to return to the Tang Dynasty, this matter will be decided." ”

The caliph summoned the principal ministers to discuss Shena's proposal.

The caliph said: "The Tang Dynasty of the Eastern Empire once attacked my **** team and slaughtered tens of thousands of my Islamic warriors, I remember this account, and sooner or later they will have to pay it back."

However, the Tang Dynasty was very powerful, and the unification of the Islamic world was not yet complete, and it was not suitable for war with the Eastern Empire for the time being.

Through the lessons of the last war, I have come to realize that there is still a gap between the Arab Empire and this powerful Eastern Empire, and there is something to learn from there. ”

The Deputy Prime Minister of the Arab Empire, Williber, said to the Caliph:

"The great caliph, the Tang Dynasty was very rich and developed, and there are many things worth learning from us, and the minister thinks that a large number of people should be sent to learn."

General Khalid said: "Great caliph, your decision is very wise!

The minister observed the Tang army, and their equipment was advanced. Mo knives, longbows, horizontal knives, armor-piercing arrows, and fire-breathing cannons are all difficult for us to resist.

The methods of making these weapons should be in the hands of Islam, and these must be sent.

The military establishment of the Oriental people is also very distinctive, their army is very well organized, soldiers and officers maintain close ties with each other, the degree of trust is very high, and it is very convenient to command on the battlefield. We also need to learn from this. ”

Other ministers agreed.

At this time, the Arab Empire, like the Tang Empire, was in a period of Zhongxing development, and the ministers were full of ideals to create the future, everyone was conscientious, and the court was united and powerful.

The caliph said: "Since everyone agrees, I have decided to send a team of talents covering military, political, cultural, and what the Tang Dynasty people call industry, science and technology, to study in the Tang Dynasty.

Know each other, learn from their strengths, and master their weaknesses. Only in this way will we be able to defeat the Tang Dynasty and wash away the shame they brought us! ”

The deputy prime minister, Weber, said to the caliph: "The great caliph, when the minister was in the Tang Dynasty, learned some information.

The advanced science and technology of the Tang Dynasty was only in the hands of a small number of people, and if the Arab Empire wanted to send people to study it with great fanfare, it would cause the Tang Dynasty people to take precautions, and I am afraid it would be difficult to achieve the goal.

The minister suggested that all those sent to study should pretend to be ordinary businessmen, use commercial activities as a cover, and operate in Chang'an for a long time. With the help of Princess Sheena, gradually infiltrate it. ”

The ministers all thought that what he said was reasonable, and they all agreed.

The caliph asked, "I am going to send a prince to the Tang Dynasty, who do you think is appropriate?" Is the third prince going to do it? ”

The third prince was born to the Caliph's concubine, and the Caliph was very fond of him and deliberately cultivated him.

Deputy Prime Minister Weber said: "Great caliph, the emperor of the Tang Dynasty attaches great importance to Princess Sheena, and the minister suggested that someone close to Princess Sheena should be better coordinated. ”

Vice Prime Minister Weber had privately received a lot of benefits from Sheena, and at the same time, he also thought that the third prince was too arrogant to take on such a heavy responsibility. In public and private, he has to help Sheena speak.

The caliph remembered Sheena's recommendation of Harold and said, "Okay, then send Harold there." ”

The Arabs organized a large caravan filled with various types of spies, sending them to the capital of the Tang Dynasty to spy on intelligence.

Before leaving, the caliph spoke to Harold alone. This was the first time the caliph had summoned Harold alone, and Harold was thrilled.

During the conversation, the caliph was very kind to him, and after some loyal and patriotic teachings, he gave him the mission of the trip.

Finally, the caliph patted him on the shoulder and said: "You have a great responsibility for this trip, and the future of the Arab Empire is pinned on you."

I value you very much, and I hope you will live up to your mission. ”

Harold was so excited that his blood boiled, and with tears in his eyes, he said in a firm tone: "Great caliph, defender of the faith!" Erchen must live up to his mission. ”

After saying goodbye to the caliph, Harold rushed back to his mother and excitedly told him about the caliph's reception of him, and his mother was deeply proud of him.

Before leaving, Deputy Prime Minister Webier specially explained to him various precautions, especially telling him that the purpose of this trip should never be disclosed to the Greek princess.

Prince Harold understands this joint very well. So, he took a huge spy agency and followed the Greek princess to Chang'an City.

Sheena didn't know anything about it, just glad that she was able to help Harold.

Xina and her party finally returned to Chang'an City.