The Persian dynasty which overthrew the Parthian empire in 224 AD and ruled until conquered by Islam in 651. The empire extended from India to Syria, where they fought with the Romans. Remains include rock reliefs, Sassanian metalwork, fine stamp seals, textiles. Archaeologically they are known from impressive architectural remains of palaces, temples, and fortifications and from the rock reliefs. Important Sassanian sites include Bishapur, Firuzabad, Naqsh-i Rustam, and Siraf.