Hai ben Sherira , better known as Hai Gaon , was a medieval Jewish theologian, rabbi and scholar who served as Gaon of the Talmudic academy of Pumbedita during the early 11th century. He was born in 93...
He is ether the son of Hai Gaon making him the grandson of Shmuel HaNagid or the son of Shmuel HaNagid ( it is disputed among genealogists) see
Joseph ibn Naghrela
Joseph ibn Naghrela or Joseph ha-...