Vrtanes I was a 4th-century Armenian religious leader who served as the fourteenth Catholicos-Patriarch of the Armenian Apostolic Church. Born around 285 in Kayseri, he belonged to the hereditary Gregorid line, being the son of Gregory the Illuminator. After succeeding Aristaces in 333, he led the church until his death in 341. He was a central figure in the early development of the Armenian Church, maintaining the lineage of his father through his own successors.