He was, and it led to a pathetic downfall. He got caught up in this one battle for control of Macedon in which a mother saw him fighting her son in the streets, so she threw a roof tile at his head and incapacitated him badly enough for a soldier to come by and behead him.
Yeah, cisgender means "you are the gender that you are." It's a nonsense word used by people who are somehow threatened by transgender people or something.