Baldwin de Burg was a nephew of Baldwin I of Jerusalem and the Count of Edessa from 1100 to 1118. In 1118 his uncle died and he became King Baldwin II of Jerusalem.[1] In the Battle of Ager Sanguinis, fought near Sarmada on 28 June 1119, the Franks suffered a disastrous defeat by the forces of Ilghazi, the ruler of Mardin. Later that year Baldwin regained some territory, but the Franks were seriously weakened.[2] Baldwin asked for help from Pope Callixtus II.