Search Result for "fourth crusade":
Wordnet 3.0

NOUN (1)

1. a Crusade from 1202 to 1204 that was diverted into a battle for Constantinople and failed to recapture Jerusalem; 



WordNet (r) 3.0 (2006):

Fourth Crusade
    n 1: a Crusade from 1202 to 1204 that was diverted into a battle
         for Constantinople and failed to recapture Jerusalem