Davidic Lineage of Ibn Yahya The Ibn Yahya family were descended from the hereditary heads of the Sanhedrin in Tiberias, thence through the Exilarchs back to King David . Ibn Yahya elite family history is virtually a capsule version of the Sephardic Jews in Spain and Portugal. Treasurers for various kings of Portugal and Spain, authors of biblical commentaries, poets, mathematicians, astrologer...