Emperor Go-Uda (後宇多天皇) was the 91st imperial ruler of Japan. His lineage is called Daikakuji-tō (大覚寺統), in contrast to Jimyōin-tō (持明院統), the line of Emperor Fushimi.
... implications, it merely designated anyone who assumed power for any period of time without a legitimate basis of authority.
The first to have the title of "Tyrant" ...