Mawdud 's successor , Aqsunqur al - Bursuqi , invaded the county in May 1114 .
Edessa resisted his siege , forcing him to return to Mosul .
Mawdud 's successor , Aqsunqur al - Bursuqi , invaded the county in May 1114 , but Edessa resisted his siege , forcing him to return to Mosul .