I.B.Tauris in association with the Iran Heritage Foundation Decline and Fall of the Sasanian Empire has been acclaimed as one of the most intellectually exciting books about late antique Persia to have been published for years. It proposes a convincing contemporary answer to an age-old mystery and conundrum: why, in the seventh century ce, did the seemingly powerful and secure Sasanian empire of Persia succumb so quickly and disastrously to the all-conquering armies of Islam? In her bold solution to this enigma, Parvaneh Pourshariati explains that the decentralized dynastic system of the Sasanian ruling hierarchy in fact contained the seeds of its own destruction. This confederacy, whose powerbase relied on patronage and preferment, eventually became unstable, and its degeneration sealed the fate of a doomed dynasty.