I play as Sweden, converted to Reformed, cannot find my CoR. Finally...
Yes, Kola. A province of 1 base tax, Sami deer hunters, tundra and probably almost nonexistant human population - barely populated even by standards of Sami nomadic people, first permanent Russian settlements appeared in year... 1466... - probably literally few thousands of people, becomes intellectual center of reformation. Second city ever embracing Calvinis doctrine, something like Geneva. One of three cultural centers of Calvinism (Reformed) propagating this faith to the entire world.
I guess in this one permanent settlement of Kola, settlement of deer hunters (fur trade good!), someone decided to embrace ethics of hard work while publishing literary works and providing charismatic speeches about the new vision of transcendent being.