Haninai ruled from 580 to 590-591 when he was put to death by Khosrau II for supporting the Parthian Bahram VI according to Karaite sources. Jews were used as soldiers by Khosrau and were led by a [http://www.jewishencyclopedia.com/articles/10222-ma-amad Mahamad ] but would have no public Exilarch again until Bostenai was installed by Umar.