His eldest brother was Gaius Julius Agrippa and his younger sister was Julia Iotapa.
Surviving inscriptions about Berenicianus reveal that his family were related to important members of Asian, non-Jewish, and Jewish aristocracy.
His maternal grandparents were King Antiochus IV of Commagene and Queen Julia Iotapa.
The Kingdom of Cetis was a small client state in the Roman Empire, in Cilicia, that was previously ruled by his Cappadocian royal ancestors and Antiochus IV.
There are three princes by the name Phasael in the Herodian dynasty, all three mentioned by Josephus in "War" (BJ) and "Antiquities" (AJ):[1]