▁served ▁as ▁an ▁arch de acon . ▁Nevertheless , ▁Const antine ▁had ▁no ▁children ; ▁apparently ▁he ▁never ▁married . ▁ ▁In ▁June ▁ 1 2 7 0 , ▁Const antine ▁Mel iten i otes ▁was ▁sent ▁by ▁By z antine ▁em peror ▁Michael ▁VIII ▁Pal ai olog os ▁( r . ▁ 1 2 5 9 – 1 2 8 2 ) ▁on ▁an ▁emb ass y ▁to ▁King ▁Louis ▁IX ▁of ▁France , ▁together ▁with ▁the ▁then - chart oph y lax ▁John ▁Bek k os . ▁The ▁purpose ▁of ▁the ▁emb ass y ▁was ▁to ▁indu ce ▁Louis ▁to ▁persu ade ▁his ▁brother , ▁Charles ▁of ▁An jou , ▁king ▁of ▁Sic ily , ▁to ▁call ▁off ▁a ▁planned ▁assault ▁upon ▁Constantin ople , ▁which ▁Michael ▁VIII ▁had ▁recently ▁re capt ured ▁from ▁the ▁Lat ins ▁( 1 2 6 1 ). ▁Louis ▁was ▁at ▁that ▁time ▁outside ▁the ▁walls ▁of ▁Tun is , ▁fighting ▁a ▁cr us ade ▁against ▁the ▁Mos le ms ; ▁after ▁a ▁dangerous ▁voyage , ▁the ▁two ▁amb ass adors ▁reached ▁Car th age ▁on ▁ 3 ▁August , ▁and ▁delivered ▁to ▁Louis ▁g ifts ▁and ▁a ▁letter ▁from ▁the ▁By z antine ▁em peror ; ▁when , ▁finally , ▁on ▁ 2 4 ▁August ▁ 1 2 7 0 , ▁they ▁were ▁granted ▁an ▁audience ▁with ▁the ▁French ▁king , ▁Louis ▁promised ▁to ▁do ▁what ▁he ▁could ▁to ▁create ▁better ▁relations ▁between ▁Michael ▁and ▁his ▁brother , ▁but ▁he ▁in ▁fact ▁could ▁do ▁nothing