Li Shimin was a little surprised. He didn't expect that Li Yan had put in so much effort to create so many good things to please him in order to change his fiefdom? Zhengzhou is a good place. Among the fiefdoms of his sons, only Li Yan is closest to Chang'an. Is there anything he doesn't feel satisfied?

Thinking of this, Li Shimin's face was a little gloomy. After waving Yuwen Hu and the guards around him, he took Li Yan for a walk on the martial arts court and asked: "Liu Lang, the fiefdom matter has been decided before. Now all the enfeoffed prefectures have established the palaces of you and several other princes, and Zhengzhou is in a good location, why do you want to change it?"

The prince’s ceasing is not a simple matter. Let’s not mention sacrifices, the title selection and other things, and the prefectures that have been enfeoffed must also be prepared. Therefore, although the official ceasing has not yet been formally distributed, the princes have actually known where they will be assigned.

"I believe that Zhengzhou is indeed a good place. Not only is it a big city, but it is also close to Chang'an, so that my son can visit you and your mother at any time, but my son has his own plans and does not want to hide under your father's wings for the rest of his life." Li Yan also put away his usual hippie smile and said seriously.

"Oh? I want to know what are your plans for you?" Li Shimin was curious and felt a little disappointed. As a father, he suddenly realized that the son in front of him had really grown up and no longer wanted him to arrange everything for him, but had already had his own ideas and plans.

What made Li Shimin even more rare is that Li Yan dared to boldly raise it in front of him. This kind of courage and courage is what he valued the most. Among other sons, even Li Chengqian, as the crown prince, and Li Tai, whom he loved the most, were dissatisfied with their arrangements, but no one dared to raise it. He would only timidly follow his arrangements, relying on this point. Li Yan was far superior to his brothers.

"Father, my son has something. I want to ask my father to see it, but this thing is of great importance, so I want to ask my father to go back to the hall to look at it." When Li Yan spoke, he couldn't help but touch the small box in the sleeve of the robe. Whether he could convince Li Shimin would be the one who looked at it.

When Li Shimin saw Li Yan's serious expression, he was even more curious. He immediately took Li Yan back to Liangyi Hall and asked everyone to withdraw. There were only the father and son left in the hall.

Li Shimin sat behind the desk, and Li Yan stood in front of the desk. He saw him take out a small box from the sleeve of the robe, and after opening it, there was a thick stack of silk cloth inside. Li Yan carefully took out the silk cloth from the inside, then bowed and presented it with his hands, "Please look, Father!"

Li Shimin reached out and took it over. When he opened it, he found that there was a strange painting on the silk cloth. The whole picture looked like a lantern. The "lantern" was painted with strange patterns on the east and west. Each pattern was also marked with words, saying that Asia, Europe, Africa, America, etc., and the blank spaces were written with words such as the Pacific Ocean, the Atlantic Ocean, etc.

Intuition, Li Shimin thought this was a map, but he thought about the prefectures of the Tang Dynasty, but he did not find any inexplicable names such as Asia and Europe. He even thought about the place names of several surrounding countries, but still had no idea. Finally, he could only raise his head and ask Li Yan: "Liu Lang, what is the drawing on it?"

"Father, what you are holding in your hand is the whole world!" Li Yan replied pretending to be mysterious.

"The whole world?" Li Shimin frowned. For a moment, he couldn't understand what Li Yan meant.

"Father, do you know how big the world we live in? What is the end of the world? Why does the sun rise from the east but set from the west, and it is reincarnation day after day, year after year?" Li Yan asked three questions in one breath. If he wanted Li Shimin to believe that this world map was real, he must first understand that they lived on a sphere, not the kind of sky and place that the ancients believed.

Li Shimin didn't expect that Li Yan would discuss with him this kind of mysterious problem that seemed to him so mysterious. However, his expression became a little strange and he asked back: "Oh? Then why did you think?"

"That's because we live on a sphere, and..."

"I've known this for a long time." Before Li Yan finished speaking, Li Shimin suddenly interrupted, and a hint of disappointment appeared on his face.

"Puff~" Li Yan almost vomited blood without holding back. He had prepared a lot of words, and he was planning to make Li Shimin's eyes open, but he didn't expect that he knew that the earth was round and looked natural. Could it be that he had traveled through time?

"Father, how do you know?" Li Yan asked weakly, holding a lot of words in his heart, not vomiting blood, but also causing internal injuries.

"Nonsense, of course I know this. As early as the Warring States Period, Huntian said that as long as anyone who has read some books will not know this?" Li Shimin said angrily. Li Yan did not like reading, which was also the place where he disliked Li Yan the most, but Li Yan was skilled without learning, which made him, the father, not even angry.

"Huntian said!" Li Yan almost slapped himself after hearing this. He had learned all the textbooks of junior high school in his previous life, but he didn't even think about it. What he didn't expect was that this theory was so widely circulated. Didn't the ancients all popular with the sky and the sky? When did he actually play with such high-tech things?

"Ahem, Father, you are talking about the Huntian theory where the world is like a chicken. This theory is actually wrong. Of course, it cannot be said that it is completely wrong. The saying that the earth is as round as the yellow in the chicken is still correct, but the sky and the sun, moon and stars are not what the Huntian theory explains..." Although he was shocked by the Huntian theory, Li Yan, as a modern person, could not admit defeat. He simply started talking about the heliocentric theory and the nine planets in the solar system. Anyway, no matter what, you must first shock Li Shimin from his knowledge, otherwise the following words will not be easy to say.

Li Shimin was a little dissatisfied at first when he listened to Li Yan's explanation. After all, Huntian's theory has been developing for so many years, and many celestial problems can be explained by Huntian's theory, but Li Yan said that Huntian's theory was wrong, which made him think that Li Yan was lying. However, as Li Yan spoke reasonably and well-founded, even Huntian's theory could not be explained, the answer could be easily found in the doctrine proposed by Li Yan, which made Li Shimin feel a little silenced and began to listen carefully to Li Yan's explanation. As he thought deepened, he felt that the doctrine proposed by Li Yan was indeed further than Huntian's theory and closer to the essence of this world.

Li Yan was dry and said, and when he saw Li Shimin's solemn expression, he was very proud. He finally calmed down the emperor's father. He picked up Li Shimin's tea "Gudong Gudong" and took a few sips, and then said again: "Father, whether it is the Huntian theory or the heliocentric theory mentioned by Erchen, they all admit one thing. That is, the earth where we live is spherical."

When he said this, Li Yan pointed to the very unstandard world map and said, "Father, please see, this is the whole picture of the sphere we live in. The continents above are land, the blank space is the ocean, and the place where our Tang Dynasty is located is this Asia."

With Li Yan's guidance, Li Shimin then discovered that on the largest land in the middle, there were actually some very shallow lines marking out areas, and the area with the most eastern and widest area actually matched the territory of the Tang Dynasty. Looking at the surrounding areas, Tubo, Goguryeo, and the Western Regions, you can find corresponding locations.

When Li Shimin saw the whole world for the first time, he felt both novel and shocked. However, when he saw that the territory of the Tang Dynasty only accounted for about one-third of the entire Asia, he frowned. Li Shimin and even the entire Tang Dynasty have always believed that he was the country of the Celestial Empire and the largest country in the world. However, when he saw this world map, Li Shimin realized that the world was so big, with seven large lands, and the Tang Dynasty actually occupied only one-third of one of the lands. This made Li Shimin, who always thought that I was the best in the world, was a little unacceptable.

Seeing Li Shimin's somewhat stunned expression, Li Yan immediately guessed that his father, the emperor, saw that the world was so vast and the Tang Dynasty only occupied a small part of it, and his self-esteem was hurt.

So Li Yan hurriedly explained: "Father, don't look at the whole world so big, but in fact, except for the Asia where we are and the Europe next to us, other continents are still in the ignorant period of eating raw meat and drinking blood, and even countries have not appeared. In Asia and Europe, the only thing that can compare with our Tang Dynasty in terms of economy, politics, culture, etc. is the only Roman Empire, that is, the "Qin" in ancient books."

Li Yan said, pointing to the Mediterranean area of ​​Europe. In fact, he didn't know the specific area of ​​the Roman Empire, but he knew about that area. However, he knew a little about the history of the Roman Empire. He continued: "When our China was still in the Qin and Han Dynasties, the Roman Empire was once strong for a while, but later it was split into two countries. Among them, the Western Roman Empire had been destroyed and its territory was occupied by others. Now only the Eastern Roman Empire was left. The situation was also very bad. It was invaded by surrounding countries and nations such as Persia. Now Persia has declined, but there is another big food emerging around it. Not only did it defeat Persia very badly, but it also had constant friction with the Roman Empire. Sooner or later a war broke out."

"I know Persia, but what country is Dashi?" Li Shimin's eyes became brighter and brighter as he listened to Li Yan's explanation, especially he was very concerned about the things around the Roman Empire. Dashi was just established a few years ago and has not yet been heard from Li Shiyan's ears.

"Qi Ming, the country of Dashi is very special. They established their country by religion and believe in a religion called Islam. The country has a combination of politics and religion, and the military is also very strong. Although it cannot be compared with our Tang Dynasty and Rome in terms of culture, politics and economy, it is a military rival that is not inferior to the Turks." Li Yan reminded that Dashi in later generations also fought with Dashi, but unfortunately, due to various unfavorable factors, the Tang Dynasty was defeated and has lost its voice in Central Asia since then. It has not been found back in several dynasties.

"Hahaha~, their combat power is as strong as possible. After pacifying the Central Plains for their father, they destroyed the Turks. Now there are only two first-class opponents, Goguryeo and Tubo. I feel that life is boring. I didn't expect that there are so many powerful countries in the extreme west. One day, I will lead the army to let them know the sharpness of my Tang Dynasty's military force!" Li Shimin shouted proudly. Today, he got the gunpowder weapon presented by Li Yan. He was still worried that Goguryeo was too weak and would not have a place to use it in the future. Unexpectedly, Li Yan immediately found him a few more powerful opponents.

"The father is wise and powerful, and my son admires him very much!" Seeing Li Shimin's heroic spirit, Li Yan immediately stepped forward and flattered, but he laughed in his heart. The Tang Dynasty is still far away from Dashi, and he didn't know that it would only take the year of the Monkey and the month of the Monkey. Li Shimin's wish to fight with the Dashi army was probably a bit sluggish.

After understanding the situation in Asia, Li Shimin asked about the situation in other continents. Li Yan didn't know much about the situation in other continents during the Tang Dynasty, so he could only talk about it roughly according to what later generations knew. Africa was better. There was an Egypt that could talk about it, and then talked about the black Africans. The Americas talked about Indians, and the other continents also talked about some human feelings, which opened Li Shimin's eyes.

"Liulang, where did you know these?" After hearing this, Li Shimin suddenly looked at Li Yan with suspicion and asked. These are not poetry, songs or inventing some new things. Like the astronomy and geography knowledge that Li Yan just talked about, if he had not been taught by a dedicated person, no matter how smart a person is, he would never know these out of thin air.

Li Yan knew that Li Shimin would ask this, so he had already thought of a countermeasure and hesitated deliberately. Then he said: "Father, in order to find the formula of glass, Erchen once offered a reward of thousands of guan to Hu Shang in Chang'an City. One of them, Hu Shang from Persia, presented a Kunlun slave who could make glass, so he asked Erchen to make glass. In addition, he also sold the astronomy and geography knowledge just now to Erchen, and for this, Erchen paid the other party a total of 2,000 guan. This world map was also painted by Erchen under his guidance."

When Li Yan spoke, he deliberately made a heart-wrenching expression, as if he was worth the effort. His words were half true and half false, and that Hu Shang did exist, so this kind of lie was the most difficult for people to distinguish. Moreover, the reason why Li Yan dared to say this was because after being beaten and intimidated by Li Yong, Hu Shang had already left Chang'an and returned to Persia more than a month ago, so he was not afraid that Li Shimin would call Hu Shang to confront him.

"Oh? A businessman actually has such a talent?" Li Shimin was still a little suspicious.

"Father, although Erchen doesn't know the other party's identity, he is definitely not an ordinary businessman, looking at the other party's words and deeds, he is definitely not an ordinary businessman. I originally wanted to recommend him to his father, but he refused to serve in the court. Later, Erchen went to him again, but found that the other party was no longer there. I don't know if he is still in the territory of the Tang Dynasty." Li Yan strives for perfection and immorally portrays a greedy businessman into a big sage hidden in the city.

"It's a pity, it's my fault that such talent cannot be used!" Li Shimin heard that the other party was missing, and immediately sighed disappointed. He did not doubt Li Yan's words. Li Shimin also knew very well that because the price of the reward was really high, the censor reported that Li Yan was extravagant, and for this he scolded Li Yan.

"Huh? By the way, weren't you going to talk about why you changed your fiefdom? Why did you turn to the world map as you said?" Li Shimin, who was feeling moved, suddenly remembered that he was just asking about the world map, but he hadn't said the reason why Li Yan changed his fiefdom...!~!
Chapter completed!