 Between 1390 and 1397 Cyril and Therapont left the Simonov monastery and travelled north to Lake Siverskoye, where they stayed in the place which eventually became Kirillo-Belozersky Monastery.For a year they lived together, and then Therapont left and moved to a location in about a dozen kilometers to the northeast now known as Ferapontovo.1398 is considered as the year when the Ferapontov Monastery was founded.