Khor Virap

Khor Virap is an Armenian monastery located in the Ararat Plain in Armenia, near the closed border with Turkey, about 8 kilometres south of Artashat, Ararat Province, within the territory of ancient Artaxata. The monastery was host to a theological seminary and was the residence of Armenian Catholicos.Khor Virap's notability as a monastery and pilgrimage site is attributed to the fact that Gregory the Illuminator was initially imprisoned here for about 14 years by King Tiridates III of Armenia. Saint Gregory subsequently became the king's religious mentor, and they led the proselytizing activity in the country.

Source: Wikipedia