In fact, there is nothing wrong with Wei Hengzi's practice, because his son is dead, and he just passed it on to his grandson according to the system of the eldest son's direct grandson. His son is the eldest. If the throne passes to him, then his son, the grandson of Wei Hengzi, is also the eldest son. In fact, apart from his history, many emperors made the same decision. Even if their sons were alive, they passed the throne on to their grandchildren.

First, the Yellow Emperor

Presumably, many people know the Three Emperors and Five Emperors, but these people only exist in myths. Zhuan Xu is the grandson of the Yellow Emperor and the son of Changyi. At the beginning, he was assisting Shao Hao. Unfortunately, after his death, Gong wanted this position as much as he did, and they fought for it for a long time. Finally, Zhuan Xu inherited the regime of Shao Hao. He was also a powerful figure, and later Xia Guo and Chu were his descendants.

Second, Kublai Khan

He has chosen a successor, and that person is Borzijit Kinkin. Prince Jin is also a talented person, which makes Kublai Khan very satisfied. But it's too good to work. 1285, a courtier asked Kublai Khan to abdicate and give the throne to the real Prince Jin. Kublai Khan was very angry. In the end, the matter was turned out, but the real golden prince died of overwork. After his death, Kublai Khan passed the throne to the third son of Prince Jin, which shows that he felt guilty about this son.

Third, Zhu Yuanzhang

In fact, no one can do it better than Zhu Yuanzhang. After the death of Prince Zhu Biao, Zhu Yuanzhang's sons were still alive. It stands to reason that this throne must be given to one of his sons. However, Zhu Yuanzhang did not do this, but passed the throne to his grandson, the later emperor Wen Jian. It was his practice that caused the "Jingnan War", which was also the weirdest thing Zhu Yuanzhang did.