Ban Zhao was an accomplished mathematician, astronomer, and poet. She is most famous female scholar.
December 25th 1926 when his father (Emperor Taisho (Yoshihito)) died.
Military campaign to defeat all enemies and then he declared himself emperor.
It is not enough to be a son of an emperor, in order to become the next emperor, since an emperor may have more than one son, and they can't all be emperor (well, they could if they wanted to form a...
His uncle and adoptive father Trajan died and as his heir he succeeded to the rulership. . .