Therapont of Belozersk (1331 – 27 May 1426) (Russian: Ферапонт Бело(е)зерский, Therapont Belo(e)zersky), also known as Therapont of Mozhaysk, known to the world as Feodor Poskochin, was a Russian Orthodox monk credited with the foundation of the Ferapontov Monastery in Northern Russia, now close to Kirillov in Vologda Oblast, and the Luzhetsky Monastery in Mozhaysk close to Moscow.

Apparently, Therapont was once commissioned by the monastery to travel to the North of Russia, to the Lake Beloye area.

At a certain point, Cyril decided to leave the monastery and seek for a remote area where he could become a hermit.

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.

Even though Therapont, after arriving to Mozhaysk, expressed very clearly his wish to return to White Lake, the prince never let him go.