1. He has a really long family history Born 23 December 1933, he is the 125th emperor of a line which is traced back more than 2,600 years, according to official genealogies. That would make it the world's oldest continuing hereditary monarchy.
In keeping with ultra-formal royal tradition, he was raised apart from his parents in an imperial nursery from the age of two.
Friday, June 09, 2017
Emperor to abdicate
So, Japan has done the right thing and will let the Emperor abdicate. The BBC has a "ten things you may not know" article about him, which includes this: