Nerses I the Great (Armenian: Սուրբ Ներսես Ա. Մեծ ) was an Armenian Catholicos (or Patriarch) who lived in the fourth century. He was the son of At'anagenes and his mother was the Arsacid Princess Bambish, a sister of King Tigranes VII (Tiran)[2] and a daughter of King Khosrov III. His paternal grandfather was St. Husik I whose paternal grandfather was Saint Gregory the Illuminator.