Stephan the Great who ruled Moldavia (present part of East Romania) between 1457-1504, was a great ruler that won 44 churches and monasteries for every battle. He lost only 2 battles in all his great life.
One of Ash Ketchum's rivals in Pokémon: Black and White is named Stephan. A running gag in the series is that his name is constantly pronounced wrong (STEEV-ən instead of SHTE-fahn).