Mission to Rostov
Rostov in the eleventh century remained one of the least-evangelized regions of Rus', and the bishops sent there before Leontius had been forced out by a populace attached to its old beliefs. Leontius, formed in the discipline of the Kiev Caves Monastery, took up the same charge and refused to abandon it despite the same hostility.
According to tradition, rather than confront the people head-on he settled outside the city and began with the youngest, instructing and baptizing the children before their parents. When an angry crowd came against him with threats to his life, he is said to have come out to meet them bearing a cross, and his fearless gentleness stopped them and won many to the faith. For this apostolic labor he is honored as the enlightener of the Rostov land.