/ Thesaurus / L Synonyms of leo iii Find synonyms for: Noun1. Leo IIIusage: Italian pope from 795 to 816 who in 800 crowned Charlemagne emperor of the Romans (750-816)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: benevolent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language