 as for ibn jaifer he is alnuman ibn jaifer ibn abbad ibn jaifer ibn aljulanda. he had invaded the land of the zanj and they killed him and captured his army.
وأما ابن جيفر فهو النعمان بن جيفر بن عباد بن جيفر بن الجلندى. كان غزا بلاد الزنج فقتلوه وغنموا عسكره.