Vrtanes also known Saint Vrtanes (Armenian: Սբ. Վրթանէս Ա. Պարթև) was the Catholicos of the Armenian Apostolic Church. Vrtanes succeeded immediately after St. Gregory I the Enlightener and Aristaces as third in line in the then-hereditary Parthian line of Catholicoi. Vrtanes was the first son born to St. Gregory I the Enlightener by his wife Miriam and his younger brother was Aristaces. He was the father of St. Husik I and Gregory by an unnamed wife. He reigned from 333 to 341.