/ Thesaurus / L Synonyms of louis the pious Find synonyms for: Noun1. Louis I, Louis the Pioususage: third son of Charlemagne and king of France and Germany and Holy Roman Emperor (778-840)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language