Western birth and conversion
According to the tradition recorded in the Orthodox calendar, Isidore was born in the German lands, by some accounts near Brandenburg, to a wealthy family and was raised in Roman Catholicism. From his youth he is said to have led an unsullied life and shown a compassionate understanding. The sources do not specify where he received the Orthodox faith, but having embraced it he distributed his wealth to the poor and, desiring the Kingdom of God, left his home to live as a pilgrim, traveling through many lands and cities before coming to Russia.