Isaac ibn Ghiyyat
Isaac ben Judah ibn Ghiyyat was a Spanish rabbi, Biblical commentator, codifier of Jewish law, philosopher, and liturgical poet. He was born and lived in the town of Lucena, where he also headed a rabbinic academy. He died in Cordoba.
According to some authorities he was the teacher of Isaac Alfasi; according to others, his fellow pupil. His best-known students were his son Judah ibn Ghayyat, Joseph ibn Sahl, and Moses ibn Ezra. He was held in great esteem by Samuel ha-Nagid and his son Joseph, and after the latter's death, Ibn Ghayyat was elected to succeed him as rabbi of Lucena, where he officiated until his death.
He was the author of a compendium of ritual laws concerning the festivals, published by Bamberger under the title of Sha'arei Simḥah, and a philosophical commentary on Ecclesiastes, known only through quotations in the works of later authors.
Ibn Ghayyat's greatest activity was in liturgical poetry; he was an author of hundreds of piyyutim, and his hymns are found in the Maḥzor of Tripoli under the title of Siftei Renanot.
One of his major contributions was his collection and arrangement of the geonic responsa which had hitherto been scattered among world's Jewry.
