Hormizd IV having persecuted the Christians and the Jews, the Talmudical academies of Sura and Pumbedita were closed, their masters removing to Firuz-Shabur, in the neighborhood of Nehardea.
The accession of Hormizd's general, Bahram Chobin, relieved the Jews from persecution; Hanan returned to Pumbedita, reopened the academy, and assumed the rectorate, which he held for nineteen years.
Thus far almost all historians agree, but not in regard to Hanan's inauguration of the era of the Geonim.
Others, however,[4] following the tradition that Giza ('Ena, Gada) and Simuna were the last of the Saboraim,[5] and that Hanan of Iskiya sat at the feet of the disciples of these masters, begin the geonic period with the restoration of the Pumbedita academy, and to its promoter they ascribe the origination of the title "Gaon".
Be this as it may, Hanan of Iskiya is remembered as the restorer of the Pumbedita Talmudical academy, and as the head of a line of teachers covering over four hundred years (589-1038), to the death of Hai Gaon and the end of the geonic period.