Two caves containing Bas-reliefs, Taq-e Bostan, Kernamshah Province. Sasanian, late 6th or 7th century. The reliefs at Taq-e Bostan decorate two grottoes cut out into a cliff beside a large pool and are a continuation of a tradition begun by the Achaemenians, in which monumental reliefs are utilized to proclaim the power of the throne and the divine right of its occupant to rule.