/ Thesaurus / G Synonyms of guibert of ravenna Find synonyms for: Noun1. Clement III, Guibert of Ravennausage: Italian antipope from 1080 to 1100 who was installed as pope by the Holy Roman Emperor Henry IV who consistently opposed efforts at papal reform (died in 1100)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: fortuitous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language