Son and successor of the patriarch Hillel II.; celebrated in connection with the perfecting of the Jewish calendar in 359. From geonic sources ("Seder Tanna'im we-Amora'im") only his name and those of his two successors are known. But in a letter written in 393, Jerome mentions that the emperor Theodosius I. (379-395) had condemned to death the former consul Esychius,for obtaining by fraud important papers belonging to the patriarch Gamaliel, who was much incensed against the culprit.