He was Exilarch of the Jews in Babylon about 580-590. Sources: 1. Stuart, R.W. "Royalty for Commoners" line 329. 2. "Encyclopedia Judiaca", Vol.6, pp.1024-1025. 3. "The Jewish Enclyclopedia" Vol.V, pp.288-290
Recognized as male heir of King David Source: Ahnentafel for Edward III of England