Yezdegerdian

Yezdegerdian Yez`de*ger"di*an (?; 277), a. Of or pertaining to Yezdegerd, the last Sassanian monarch of Persia, who was overthrown by the Mohammedans; as, the Yezdegerdian era, which began on the 16th of June, a. d. 632. The era is still used by the Parsees. [1913 Webster]