Leo I uncommon noun 1. the pope who extended the authority of the papacy to the west and persuaded Attila not to attack Rome (440-461) SynonymsLeo ISt. Leo ILeo the Great Related words Word family LeonidasLeonide Fedorovitch MassineLeonid BrezhnevLeonid Fyodorovich MyasinLeonid Ilyich BrezhnevleonineLeotia lubricaLeo III Broader terms Popesaint WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
