The Collaborative International Dictionary of English v.0.48:
Conqueror \Con"quer*or\ (k[o^][ng]"k[~e]r*[~e]r), n. [OF. conquereor, fr. conquerre,] One who conquers. [1913 Webster] The Conqueror (Eng. Hist.). William the Norman (1027-1067) who invaded England, defeated Harold in the battle of Hastings, and was crowned king, in 1066. [1913 Webster]