Source : Webster's Revised Unabridged Dictionary (1913)

Conqueror \Con"quer*or\, n. [OF. conquereor, fr. conquerre,]
   One who conquers.

   {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.

Source : WordNet®

conqueror
     n : someone who is victorious by force of arms [syn: {vanquisher}]