I suspect some medieval baron holds that title. Gilles de Raiss raped and killed up to 600 children.
Something like 1% of all people in the world are supposedly descended from Genghis Khan and his close family. The Mongols were apparently into rape.
“Gilles de Raiss”
A truly sick individual. It’s hard to read some of the accounts of what he did even though they happened so long ago.