▁Old enburg ▁and ▁the ▁arch bishop ▁Bre men - H amb urg ▁to ▁make ▁an ▁end ▁to ▁their ▁fre ed oms . ▁The ▁arch bishop ▁ex communic ated ▁them , ▁and ▁Pope ▁Gregory ▁IX ▁declared ▁a ▁cr us ade ▁in ▁ 1 2 3 2 . ▁The ▁St ed ingers ▁were ▁defeated ▁in ▁ 1 2 3 4 . ▁ ▁Arag on ese ▁Cr us ade ▁The ▁Arag on ese ▁Cr us ade , ▁or ▁Cr us ade ▁of ▁Arag ón , ▁was ▁declared ▁by ▁Pope ▁Martin ▁IV ▁against ▁the ▁King ▁of ▁Arag ón , ▁Peter ▁III ▁the ▁Great , ▁in ▁ 1 2 8 4 ▁and ▁ 1 2 8 5 . ▁ ▁Cr us ade ▁against ▁the ▁Tat ars ▁In ▁ 1 2 5 9 ▁Mong ols ▁led ▁by ▁Bur und ai ▁and ▁N og ai ▁Khan ▁rav aged ▁the ▁princip ality ▁of ▁Hal ych - Vol yn ia , ▁Lith u ania ▁and ▁Poland . ▁After ▁that ▁Pope ▁Alexander ▁IV ▁tried ▁without ▁success ▁to ▁create ▁a ▁cr us ade ▁against ▁the ▁Blue ▁Hor de . ▁ ▁Second ▁Council ▁of ▁Lyon ▁The ▁Second ▁Council ▁of ▁Lyon ▁was ▁conv oked ▁to ▁act ▁on ▁a ▁p ledge ▁by ▁By z antine ▁em peror ▁Michael ▁VIII ▁to ▁reun ite ▁the ▁Eastern ▁church ▁with ▁the ▁West . ▁W ishing ▁to ▁end ▁the ▁Great ▁Sch ism ▁that ▁divided ▁Rome ▁and ▁Constantin ople , ▁Gregory ▁X ▁had ▁sent ▁an ▁emb ass y ▁to ▁Michael ▁VIII ▁Pala e olog us , ▁who ▁had ▁recon quer ed ▁Constantin ople