The "Sacred Covenant of the Four Kingdoms" referred to as the "Covenant of the Four Kingdoms", this covenant was led by the Tang Dynasty, with the participation of Dashi, Persia and Li Su's Qi Palace, and signed this far-reaching covenant in Chang'an.

The content of the four-nation alliance affected both military and economic aspects, of which the military content was simple, that is, each country promised that in the next ten years, the four countries would not go to war in any situation, and the Tang Dynasty also pulled Persia into this treaty.

In the economic aspect, the content of the regulations is more complicated, the most important of which is the Four-Power Trade Treaty, which stipulates that the four countries open their domestic markets to each other, allow free passage of merchants from various countries, and also stipulate a uniform tax rate to facilitate the development of commerce. There are also some small details, such as the treatment of foreign businessmen who violate the law in the country, and the rights to residence and freedom of passage.

In addition, Li Su also pointed out that although Da Shi has fully opened the Suez Canal, the management of the Suez Canal is still a little chaotic, and the tax is also very unreasonable, so he asked Da Shi to rectify the Suez Canal, and he, Datang, and Rome will send officials to supervise. Although Da Shi thought that Li Su was interfering in Da Shi's internal affairs, under pressure from the three parties, they had to agree to this request.

The signing of the four-nation covenant will have a direct impact on the world pattern in the next ten years, and it is also the first treaty to include the Suez Canal in it, which can be said to have a very far-reaching impact. With the standardization of the management of the Suez Canal, the exchange between the East and the West has also become more convenient, and special goods from all over the Tang Dynasty have poured into Rome and other parts of Europe, and at the same time, the Central Plains culture has also begun to invade this area. Europeans are proud to use goods from the Central Plains.

In addition, many Roman scholars went to the Central Plains to exchange with scholars from the Tang Dynasty and various parts of Taiwan. And they also like the living environment in the Central Plains very much, and most of them choose to move their families to places like Datang or Taiwan. For these scholars, especially some talents in astronomy, arithmetic, machinery, etc., both Li Shimin and Li Su are very welcome, after all, the Eastern Roman Empire has a long history and complements the Central Plains civilization in many aspects.

For example, for Li Zhen and Li Yun, although they did not participate in the Four-Power Covenant, it gave them a relatively stable external environment, and they did not have to worry about meeting Da Shi in a short period of time. Coupled with the stability of the Suez Canal, the number of ships traveling between the Central Plains and the Red Sea has increased dramatically, and Tianzhu is located on this route, so it has also directly driven the economic development of Tianzhu in various places, especially some ports in the coastal areas, which have developed rapidly and become an important financial source in the hands of Li Zhen and Li Yun.

A few months later, Li Zhen and Li Yun in Zhongjing City welcomed an important guest.

"Third brother, I didn't expect you to come to Tianzhu. If I knew we should have gone straight to the port to pick you up! Li Zhen held the wine glass in her hand and said excitedly, this is a private banquet, Li Zhen and Li Yun sat on both sides. And sitting in the middle is Li Ke, who is going to Africa.

Li Su arrived in Tianzhu a month ago, but he first went to Ceylon Island for half a month and bought a lot of gems for Yang and other women in the family. Then he landed on the Tianzhu Continent, but he did not inform Li Zhen and Li Yun. Instead, he concealed his identity and turned around in the territory of the two, after all, he will also establish a country overseas like Li Zhen and Li Yun in the future. Being able to learn something now is only good for him. Even Li Su had arrived in Zhongjing two days earlier, and after visiting the city, he had come to the palace to see Li Zhen and Li Yun.

"Seventh brother, eighth brother, along the way, I have turned around several big cities under your rule for my brother, and found that many of these big cities have experienced war, but now they are showing a thriving scene, which is really amazing, it seems that the two of you have really put a lot of effort into the past few years!" Li Ke praised with a smile.

Li Ke came all the way, and his heart was indeed greatly shaken, and Li Ke didn't need to say that all places were well governed, and the economic development was extremely rapid, even a distant place like Ceylon Island was also a sign of prosperity. But what he didn't expect was that Li Zhen and Li Yun were no longer the two children who followed his ass back then, they not only laid down half of Tianzhu's land, but also ruled very solidly, although the economic development was not as good as Li Yun, but it also showed a sign of prosperity.

Hearing their brother's praise, Li Zhen and Li Yun were very happy, after all, Li Ke was a few years older than them, and he had been their role model since childhood, and now they could get his praise, which naturally made them more satisfied.

"By the way, third brother, I heard that the sixth brother said that you also want to build a territory of your own, and there are three choices, how about it, third brother, have you thought about it?" The impatient Li Zhen asked first.

Li Ke smiled when he heard it and said: "Liulang did give me three suggestions, Australia, America and Africa next to you, but I have been to Australia, the population there is too small, and the civilization of the local natives is not high, so if you want to develop, you still have to rely on the Han people, but now the number of Han people in the hands of Liulang of the Tang Dynasty is somewhat insufficient, let alone immigrating to Australia, so I have removed Australia." Li Ke said with a smile.

In fact, the reason why Li Ke said above is only one of them, the reason why he gave up Australia is mainly because after he went to Australia, he found that Li Su had made a lot of effort to develop Australia, although he knew that as long as he opened his mouth, Li Su would definitely give him Australia without saying a word, and even the cities and people there were all his, but Li Ke didn't want to take advantage of his younger brother.

What's more, Li Ke also knows that Li Qi, Li Su's eldest son, is called Australia, although this doesn't mean anything, but Li Ke doesn't want people to say that he and his nephew are grabbing territory.

However, after Li Zhen heard that Li Ke gave up Australia, his eyes lit up and said: "Third brother, it's right if you don't go to Australia, otherwise our brothers will be too far away, if you want me to say, you just go to Africa, there is a big island in southern Africa, the area is very vast, not much worse than Jinzhou in the South Seas, you can occupy it first, and then slowly accumulate strength, and wait until the strength is enough, and then land in Africa in a big way, then our brothers are not far away, and we can support each other in anything!" ”

Hearing Li Zhen's words, Li Yun also immediately echoed: "It's still the eighth brother's brain turning fast, that big island is indeed a good place, and the distance from the African continent is not far, just like Ceylon Island and Tianzhu Continent, although it is lonely overseas, but it can be attacked and defended, plus Africa has become a new slave capture base, and many slave capture teams have established a stronghold on the island, if the third brother goes there, not only can our brother give you support, but also can use the strength of the slave capture team, It can even make slave hunting a major source of income in your hands! ”

Hearing Li Zhen and Li Yun's introduction, Li Ke couldn't help but feel a little moved, but he then smiled and said: "This matter is not in a hurry, you also know my personality, I like to investigate everything in person, and then be fully prepared, so as for which place to choose, everything will wait until I have been to Africa and the Americas!" ”

Seeing that Li Ke had his own plans, Li Zhen and Li Yun were not easy to persuade again, and began to talk about some private matters, such as the situation in Datang in recent years, and whether there was any news in Taiwan and other places, especially for the last trip to Australia by Li Ke and Li Yun, Li Zhen and Li Yun were very interested.

However, when Li Zhen and Li Yun heard that Li Ke had to terminate the trip because of the smallpox outbreak in Australia, both of them sighed, and then Li Zhen spoke: "Third brother, you have been in Tianzhu for a few days, and you have also changed a lot of cities, now the younger brother wants to ask, what do you think Tianzhu impresses you the most?" ”

Li Ke was stunned when he heard Li Zhen ask such a strange question, but then he raised his head and thought about it carefully, and after a while, Li Ke patted his thigh and said: "Eighth brother, if you don't ask, I almost forget, since I arrived in Tianzhu, it has bittered my nose, and you are too stinky here, especially on the streets, the feces are smelly everywhere, and I have three sachets on my body that can't suppress the smell!" ”

Li Ke's words are indeed not an exaggeration, what impressed him most about Tianzhu was the word 'stinky', and the reason for this situation was caused by several reasons.

For example, the influence of natural climate, because the climate of Tianzhu Continent is very hot, so in this natural environment, people are naturally more prone to sweating, plus Tianzhu people do not pay much attention to personal hygiene, some people do not take a bath for a long time, especially those of the lower castes, the smell of their bodies is greater, and sometimes even far away can smell a sour odor.

What's even more terrifying is that most of the food of Tianzhu people will use curry, which is made of various spices to eat more, which will also affect people's body odor, and even work with a strange smell of curry, which also makes Tianzhu people's body odor very amazing.

In addition, the influence of religion is also very important, because Brahmanism advocates non-killing, and vegetarianism, especially the high castes, which also leads to the prosperity of animals in Tianzhu, and even enter the city, living in harmony with humans, such as cattle rampaging on the streets of Tianzhu, in addition to elephants, leopards, etc., they are all frequent visitors on the city streets.

Even when these animals die on the side of the road, no one pulls them away and eats them, but allows them to rot, and the situation of open defecation is so severe that defecation can be seen everywhere, especially in crowded cities.

Based on the above reasons, the environment in Tianzhu City can be imagined, and Li Ke is not exaggerating to say that his nose suffers. (To be continued......)