T-S NS 308.58
On verso part of a letter addressed to Moshe Halevi, The Head of Geon Ya'aqov yeshiva. He was appointed as Gaon already ariund 1140, when Judah Halevi arrived to Egypt., and was titled Nagid for short period after the death of Shemuel b. Hananya. Moshe was Sar Shalom's father (See Friedman in Zion, 70, p. 482). AA