Hulagu Khan , also known as Hulagu , HÃ 1\/4 legÃ 1\/4 or Hulegu ( Ð Ò Ð '' Ñ Ð Ò , KhÃ 1\/4 legÃ 1\/4 ; Chagatai \/ ; Arabic : Ù Ù Ù Ø Ù Ù ; c. 1217 â `` 8 February 1265 ) , was a Mongol ruler who conquered much of Southwest Asia . For the head of the Chagatai khanate , please see Qara HÃ 1\/4 lÃ `` gÃ 1\/4 Hulagu Khan , also known as HÃ 1\/4 legÃ 1\/4 , Hulegu or Halaku ( , derived from the word for `` surplus '' ) , KhÃ 1\/4 legÃ 1\/4 ; Chagatai\/Urdu : Û Ù Ø Ú Ù - Hulaku ; Persian \/ ; ; c. 1217 -- 8 February 1265 ) , was a Mongol ruler who conquered much of Southwest Asia .