The Order of the Geonim according to Rash"b

Rav Chanan of Ishka became the head of Pumbedita in the year 950 of the Seleucid era, which is year 4349 [(the author of Shada"k, page 36b, wrote that he received this from the students of Rav Achai and Rav Ina)]. He was the head of the Geonim and ruled for 25 years until year 4374. The Ra'avah counted him as the second generation of the Rabbanan Savorai [(Tzemach David). And in Yuchsin, in the letter of Rashba"b, from year 4400 he ruled 69 years, and it should read 950].

In this year there was a great earthquake throughout the world and the great Temple that the Jews built in Jerusalem by the command of Emperor Julius with great expense fell. On the following day a great fire came and all the iron in the building melted and countless Jews were burned to death. Emperor Valentinian sent other Jews from Constantinople and rebuilt all that was destroyed [(Shada"k, page 109b)].