Porfiry Korneyevich Ivanov (Russian: Порфирий Корнеевич Иванов) (February 20, 1898 – April 10, 1983) was a Russian mystic whose beliefs have attained a cult status, with followers estimated in the tens of thousands. He was a self-proclaimed doctor, although he had no formal certification. The Russian Orthodox Church has considered his teachings to be heretical, and calls the cult "Ivanovites". Ivanov was imprisoned in a psychiatric hospital. In his thirties he supposedly cured himself of cancer through spiritual cleansing and exposure to extreme cold weather