Idi Amin was the President of Uganda from 1971 to 1979. He rose to power through a military coup and is remembered for his brutal dictatorship, which included widespread human rights abuses and economic mismanagement.
This is based on winning 1 head-to-head matchups with other famous people, but also losing 20 head-to-head matchups.
Most recently Idi Amin lost a matchup to Ai Weiwei (#1614) voted by someone from Canada.