Feodosy Kosoy, "Feodosy the Squint-Eyed" (Феодосий Косой) (fl.
1550s) was a Russian serf-monk in the time of Ivan the Terrible.
He preached full equality, rejecting church hierarchy, the Trinity, the sacraments, icons, and churches.
[1] His preaching was condemned along with that Matvei Bashkin and the Abbot Artemy in 1553.
[2] He fled to the safety of Lithuania and the community of Polish Brethren.