Caligula, the notoriously erratic Roman emperor known for his bloodthirsty cruelty, probably also possessed a nerd’s knowledge of medicinal plants, according to a new Yale study. The study, by the ...

NEW HAVEN, Conn. — Most people know Caligula as one of history’s most deranged rulers: a bloodthirsty Roman emperor who supposedly made his horse a consul and murdered people for entertainment. But ...