Yang Liang
It is not known exactly when Yang Liang was born, but it is known that he was the youngest of the five sons of Yang Jian and Yang Jian's wife Dugu Qieluo. As the third of his older brothers, Yang Jun, was born in 571 (the fourth, Yang Xiu, similarly has an unknown birth year) and he was already born at least by the time that Yang Jian seized the throne from Emperor Jing of Northern Zhou, ending Northern Zhou and establishing Sui Dynasty as its Emperor Wen in 581, he would have been born sometime between 573 and 580. In 581, after Emperor Wen took the throne, he created his sons imperial princes, and Yang Liang was created the Prince of Han.