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from Wikipedia:
Sevanavank ("Սևանավանք" in Armenian, meaning monastery of Sevan) is a monastery located on the northwestern shore of Lake Sevan in the eastern Armenian province of Geghark'unik', not far from the town of Sevan. According to an inscription in one of the churches, it was founded in 874 AD by princess Mariam, the daughter of Ashot I who became a king a decade later.