On festive occasions, the head of the college of Sora sat at the right side of the exilarch.
Bostana was the first exilarch who was the vassal of the Mahometans.
The Jewish chief priest may be said to be the successor of the exilarch or resh galutha of the earlier period.
But if the exilarch was not learned, he delegated this duty to the Gaon of Sora.
When the Law was read, they brought the scroll to the exilarch, which was looked upon as a royal prerogative.
So the office of exilarch was left vacant for a year or two.
The exilarch appealed to the blind Nissi Naharvani to assist him in his choice.
The Karaite disturbances also contributed to lessen the authority of the exilarch.
Al-Muktadir sent for the poetical exilarch, was pleased with him, and finally asked him what favor he could confer upon him.
There were certain privileges connected with the Gaonate, upon which even the exilarch did not venture to encroach.