There is a published legend that when the Moslem's conquered Persia
(or Iraq?) the Caliph, in order to disgrace the Persian King, gave the
king's daughter as a slave to the Gaon (Bustenai ?), the exilarch of
the Jewish community. The Exilarch immediately freed the slave and
converted her to Judaism and married her (according to a Torah dictate?).

The story goes on that the MaHaRa"L was a descendant of this match.

What is known >from trees of the Mahara"l, is that he was a fourth or
fifth generation of an exile >from the inquisition in Spain.

Does anyone know if any research was done to verify or negate the
above story regarding the Persian Princess?

Yoni Ben-Ari (a presumed descendant of the Mahara"l -and the princess)
Jerusalem