St. Stefan is credited with strongly resisting the efforts of Byzantine Emperor Michael VIII Palaiologos to impose Roman Catholicism on the Balkans after the Union of Lyons in 1274.
He was also a builder of over forty churches and/or monasteries in Jerusalem, Constantinople, Salonika, Macedonia, Serbia, Bari, Italy, Rome and on Mount Athos, which he also endowed with many icons, books, embroideries, and holy vessels.
When St. Stefan died in 1320, his body did not decay, and he worked many miracles. His incorrupt body is still preserved in Serbia to this day.
Notice this service takes place on the Holy Table.