 Ibn Ubayy was one of the chiefs of the Khazraj, who then were in conflict with the other major Arab tribe of the city, the Banu Aws.During the "fidjar", the so-called "sacrilegious war", Ibn Ubayy had led parts of the Khazraj tribe on the first day of fighting but held aloof on the second day.Also, he did not participate in the Battle of Bu'ath because of a quarrel with another leader over the execution of Jewish hostages.