One of the earliest instances of a princely foundation for a monastic complex was the monastery of Sewan. Its foundation also provides the earliest explicit reference to the use of the Basilian Rule, translated in the sixth century, by an Armenian monasctic community (Garsoian 2005—7: 183). The monastery was built in 874 on the island of Sewan in Lake Sewan by Princess Mariam, daughter of Prince of Princes Ašot Bagratuni and widow of Prince Vasak Gabur Siwni (Pogossian 2012).
Mariam's example was followed by her son Grigor Sup'an II as well as by other members of the Bagratuni royal family and princess of Siwnik'.
