In the fourteenth year of Zhenguan of the Tang Dynasty, Goguryeo Rongliu King Gao Jianwu sent his son Gao Heng to the Tang Dynasty to pay tribute to Chang'an, restarting the exchanges between the two countries that had been interrupted for 11 years.

When King Rongliu inherited the king of Goguryeo, it coincided with the death of Emperor Yang of Sui, and when the Tang Dynasty was first established, Emperor Li Yuan of Tang Gaozu had no time to take care of Goguryeo.

Emperor Yang of the Sui Dynasty made several expeditions to Goguryeo, although they all ended in failure, but they also dealt a heavy blow to Goguryeo, and the king of Rongliu, Gao Jianwu, ascended the throne for the first time, and urgently needed to rectify the domestic order.

At the end of the Sui Dynasty, Emperor Yang of the Sui Dynasty raised troops to conquer Goguryeo three times, which caused changes in the country and rebellion, which eventually led to the change of dynasty.

At the time of the fall of the Sui Dynasty, the other side of the war, King Yingyang of Goguryeo, also died in that year, and the two sides of the entangled enemy withdrew from the stage of history almost at the same time. As successors, the Tang Dynasty of the Central Plains regime and the successor King Rongliu of Goguryeo were both eager to rectify domestic problems and consolidate the stability of the regime, and neither of them wanted to continue the haze of war.

In particular, Goguryeo, as a vassal state, had to take a positive attitude and heal the rift with the Central Plains Dynasty in order to ease its relations with the suzerainty as soon as possible, and this historical mission fell to the newly succeeded King Yeeliu.

Rongliu Wang Gao Jianwu, also known as Gao Cheng, is the half-brother of the former Goguryeo king Yingyang Wang Gao Yuan, who reigned for 29 years without a crown prince, and Rongliu Wang Gao Jianwu inherited the Goguryeo throne in the form of brother and brother.

In the last years of King Yingyang, although Goguryeo obtained the understanding of Emperor Yang of Sui on the condition of "sending envoys to beg for surrender" to Sui and sending him back to Hu Sizheng, a traitor of the Sui Dynasty, King Yingyang still refused to obey the will of Emperor Yang of Sui to summon him, showing that he maintained a vigilant and hostile attitude towards the Sui Dynasty.

Obviously, this does not match Goguryeo's political needs at the moment when "the country is also in trouble" and hopes to restore a peaceful environment as soon as possible. The Goguryeo aristocracy urgently resolved its external worries as soon as possible in order to free up energy to stabilize domestic contradictions and restore economic production in order to prevent the occurrence of something that threatened its political rule.

The attitude of the king of Youngyang, on the other hand, was contrary to the political needs of the moment, which angered the Goguryeo aristocracy and eventually became a victim of the political struggle.

Before the death of King Yingyang, he had lost the support and support of the domestic aristocracy, and the loss of power of his branch was inevitable.

At the beginning of the succession of King Gao Jiancheng of Rongliu, the lesson of the Sui Dynasty greatly stimulated the new monarch, so in the face of the Central Plains Dynasty, he launched a policy attitude diametrically opposed to that of King Yingyang, and actively sent envoys to the Tang Dynasty to seek good relations with the suzerain.

In the 14 years since the founding of the Tang Dynasty, Rongliu Wang Gaocheng has been sent to Chang'an nine times, paying tribute to the Tang Dynasty, and has always shown goodwill with the Tang Dynasty.

The reversal of Rongliu Wang Gaocheng's attitude towards the Tang Dynasty originated from the fact that in the fifth year of Zhenguan, Li Shimin "sent Sima Changsun Shi, the governor of Guangzhou, to collect the bones of the Sui Dynasty in Goguryeo, and destroyed the Jingguan established by Goguryeo."

Li Shimin's move was nothing more than a gesture to appease the families of the war dead in the country, to comfort the dead, and of course, it also had the intention of deterring Goguryeo and restoring the majesty of the suzerain.

But if this is considered to be a signal of declaration of war against Goguryeo, it is the idea of King Go-chan to build a frightened bird.

At the beginning of the Tang Dynasty, after the rebellion at the end of the Sui Dynasty, the registered population dropped from 9 million households to 2 million households, and the people's livelihood was extremely withered, and a stable environment was urgently needed for the people to recuperate.

They are also eager to open up the Western Regions, restart the Silk Road, and develop domestic economic and trade, and there are not a few hostile forces.

Li Shimin will think about it at this time, if he wants to conquer Goguryeo, the former Emperor Yang of the Sui Dynasty has made several expeditions to Goguryeo, and the painful lesson is not enough?

This move ten years ago was wrongly understood by Gao Jianshu, the king of Rongliu, who made him afraid that Li Shimin, who was in the Tang Dynasty, would send a large army to attack Goguryeo again, like Emperor Yang Guang of Sui, and began to build the Great Wall on the border, from Fuyu City in the northeast to the sea in the southwest, more than a thousand miles.

After that, Rongliu Wang Gao Jiancheng severed frequent contacts with the Tang Dynasty.

This time, after eleven years, he once again sent the prince Gao Heng to the Tang Dynasty to pay tribute, worship the Son of Heaven, and hope to rebuild the old friendship with the Tang Dynasty.

Although Li Shimin was dissatisfied with Goguryeo, built the Great Wall of thousands of miles on the border of Liaodong, and regarded the Tang Dynasty as an enemy, the king of Goguryeo took the initiative to send the prince to pay tribute, and he was still very happy, and gave a high-standard reception, and gave the prince Gao Heng a very rich reward.

Come and don't be rude, Datang, as the kingdom of the Celestial Empire and the state of etiquette, naturally can't lose the number of etiquette.

In the fifteenth year of Zhenguan, Li Shimin sent Chen Dade, a staff officer, to pay tribute to the Tang Dynasty under the pretext that the prince of Goguryeo had paid tribute to the Tang Dynasty and the Tang Dynasty had replied to him, which was actually to go deep into Goguryeo to spy on intelligence.

After Chen Dade, as the envoy of the suzerain, came to Pyongyang, the capital of Goguryeo, the noble class of Goguryeo expressed a very welcome to the envoys from the Tang Dynasty.

Goguryeo's great opponent Huyuan Gai Suwen visited Chen Dade's place of residence three times, presented generous gifts, and tried his best to express his respect for Datang, hoping to rebuild the old friendship with Datang.

On the contrary, it was Rongliu Wang Gao Jiancheng, and when he met Chen Dade, he ordered the elite soldiers to wear armor and arrange troops for drills, and the momentum was amazing.

On the surface, the practice of retaining Wang Gaocheng seems to be showing Chen Dade that he attaches great importance to the envoys of the Tang Dynasty, but why not have the intention of demonstrating to the Tang Dynasty!

In fact, it is no wonder that King Rongliu Gao Jianwu, King Rongliu has always been vigilant against the Tang Dynasty, so he has been constantly building the Great Wall.

Rongliu Wang Gaocheng built the Great Wall to resist the possible attack of the Tang Dynasty, obviously showing another departure and confrontation with the suzerain, and the relationship with the Tang Dynasty, which had been working hard for more than ten years, was pulled back into the freezing point.

This sudden cooling of relations with the Tang Dynasty is obviously not in line with the interests of the Goguryeo aristocracy at this moment.

At this time, the Tang Dynasty was in all directions, and the national strength was booming, and the three countries of Haidong needed to rely on the support of the Central Plains Dynasty to gain the greatest advantage in the confrontation with each other.

At this time, deviating from the suzerainty will only exacerbate the contradictions of Goguryeo's domestic rule, worsen its external environment, and put it at a disadvantage in foreign relations.

Under the unanimous request of the Goguryeo aristocratic class, in order to preserve his throne and continue to gain the support of the aristocratic class, King Rongliu had to send his son Gao Heng to the Tang Dynasty to rebuild the old good.

Goguryeo needed to rely on the political support of the Central Plains Dynasty, so his attitude towards the Tang envoy Chen Dade was very different from that of Lu Yuan Gai Suwen.

After Chen Dadeok arrived in Goguryeo, he gave generous gifts to all the officials of Goguryeo, so he was able to understand all the situations in Goguryeo.

When I saw the Han people living here, I told them about the survival of their relatives one by one, so that everyone was moved to tears. Therefore, everywhere Chen Dade went, the scholars and ladies watched from the sidelines.

After returning to Chang'an, Chen Dade reported to Li Shimin what he had seen and heard in Goguryeo, and because Yuangai Suwen often expressed goodwill to him, Chen Dade couldn't help but say more good things about Yuangai Suwen.

After hearing this, Li Shimin said: "Goguryeo has only four states under its jurisdiction, and if I send tens of thousands of troops to attack Liaodong, all cities will definitely come to the rescue."

If we were to use a water army, it would be very easy to go from Dongnai to Pyongyang. It's just that the world has just been peaceful, and I don't want to work the people anymore. ”

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