Kirillo-Belozersky Monastery, known in English as White Lake St. Cyril's Monastery, is a male monastery of the Vologda Eparchy of the Russian Orthodox monastery located on the shore of Lake Siverskoye within the town of Kirillov, Russia which developed from a settlement (sloboda) that grew around the monastery. In the XV-XVII centuries, it was one of the largest monasteries and the strongest fortresses in Northern Russia.