What is "gregorids"

Gregorids were an Armenian noble family descended from St. Gregory the Illuminator (c. 257-330), and thus of Arsacid stock, whose members served as patriarchs of Armenia from the early fourth century to the death of its last male member, St. Sahak I Souren Pahlav, in 437/439. Following Sahak’s death, his daughter, Sahakanoysh Souren Pahlav, princess of Armenia, carried the Gregorid domains in the western provinces of Greater Armenia into the family of her husband, Hamazasp I Mamikonian, and the patriarchate of Armenia ceased to be a hereditary office.