In 534, the Northern Wei chancellor Gao Huan supported the northern Wei Xiaowen Emperor's great-grandson Yuan Shanjian as emperor, and Eastern Wei was formally established, and Gao Huan became the actual ruler of the dynasty; in 535, the Northern Wei chancellor Yuwen Tai supported the Northern Wei emperor Xiaowen's grandson Yuan Baoju as emperor, and Western Wei was formally established, and Yuwen Tai became the actual ruler of the dynasty. Northern Wei was officially divided into Eastern Wei and Western Wei, with Gao Huan and Yuwen Tai respectively controlling the government, and these two were political enemies, and naturally Eastern Wei and Western Wei had always been hostile, including Northern Qi, which was established by Gao Huan's descendants who seized the Eastern Wei regime, and Northern Zhou, which was established by Yuwen Tai's descendants who seized the Western Wei regime. Later, the Northern Zhou Dynasty destroyed northern Qi, the Sui Dynasty was established by the Northern Zhou Dynasty, and after the fall of the Sui Dynasty, the Tang Dynasty was established.
The rulers of Northern Qi, including Gao Changgong the Prince of Lanling, were descendants of Gao Huan, while DuGuxin, Yang Zhong (Yang Jian's father), and Li Hu (Li Shimin's great-grandfather) were all under Yuwen Tai and were members of the Twelve Generals of the Eight Pillars, the Guanlong noble clique.
Northern Zhou attacked Northern Qi several times, and in the Northern Zhou War against Northern Qi from 563 to 564, both the Northern Zhou general Yang Zhong and the Northern Qi Lanling King Gao Changgong participated in the battle. Yuwen Tai's son Yuwen Xian and nephew Yuwen Hu were even more involved in the battle. It was in this battle that King Gao Changgong of Lanling became famous in the first battle, and at the celebration meeting after the great victory of The Mountain, the generals composed the "Lanling King's Entry Song" for the Lanling King, which was very spectacular. From here, the Dugu clan, Yang Jian, Li Shimin and the Lanling King should be regarded as hostile relations.
Moreover, The Lanling King and these three people did not have much blood relationship, the only thing was that the Lanling King and Li Shimin could have such a relationship. Li Shimin's wife Empress Changsun's mother Gao Shi was after the Northern Qi Clan, Gao's grandfather was Gao Huan's brother, and Lanling Wang was Gao Huan's grandson, that is to say, Gao Shi was the sister of Lanling King, in fact, the relationship was already very far away, not to mention the relationship between Li Shimin and Lanling King.
Therefore, among these four people, Lan Ling Wang was the most marginal person, and he had basically no blood relationship with the ancestors or fathers of the other three people except for hostile relations.
Looking at the relationship between the Dugu clan, Yang Jian and Li Shimin, there are three Dugu clans in history during the Southern and Northern Dynasties, they are all the daughters of Du Guxin, of which the eldest is the empress of Northern Zhou Yuwen Yu, the fourth is Li's wife, Li Yuan's mother, and the seventh is Yang Jian's empress, among these three Dugu clans, Yang Jian's empress Dugu Jia Luo is the most well-known in history, after all, her influence on Yang Jian is too great, and she also participates in the government, and the criticism and praise left in history far exceed her two sisters. It can be said that her two sisters have not left any traces in history, especially Empress Yuwen Yu, who is like a small transparent, and Li's wife Dugu shi at least left some traces in history because of the relationship between Li Yuan and Dou.
Dugu Jialuo was the wife of Emperor Yang Jian of Sui, the aunt of Li Yuan, the emperor of Tang Gaozu, and the aunt of Li Shimin. And Li Yuan's mother Dugu Shi is the sister of DuGu Jia luo, Yang Jian also calls a sister, Yuwen Yu's empress is Yang Jian's eldest sister, is Li Shimin's aunt, of course, this is from the perspective of blood relations. It's more complicated from a political point of view.
After Yang Jian usurped the Sui Dynasty in Northern Zhou, Dugu Jialuo was very good to his nephew Li Yuan, Yang Jian naturally also loved Li Yuan because of the relationship between dugu clan, Li Yuan lost his father in his early years, and when he grew up, he made a thousand cattle and entered the workplace, and later Du Gu's second son Yang Guang succeeded to the throne, Li Yuan was reused step by step, but in the later period, as the form of national uprising intensified, Li Yuan and his son Li Shimin also began to remember the world laid down by his uncle Yang Jian, and eventually replaced it, the Sui Dynasty collapsed, and the Tang Dynasty was established. The Tang Dynasty was basically established on the basis of the Sui Dynasty, and the rules and regulations were inherited by the Sui Dynasty, from here, Li Yuan's father and son picked up a big bargain, just like Yang Jian picked up a big bargain in Northern Zhou.