Son of the Chorasanian governor Farruḫ-Hormizd, who overthrew Azarmiducht in AD 631 and effected the recognition of Yazdgird III in 633. As supreme commander he tried to fend off an Arab incursion. Under R.'s leadership, for example, a Persian army advanced as far as the border fortification of Al-Qādisīya on the edge of the Syrian Desert. In the spring of 636 or 637 a battle of several days developed there, in which the Persians were defeated after R. had fallen (PLRE 3B, 1100).
B. W. Robinson, s. v. R., EI2 8, 1995, 636-638