Another ruler of this name crushed Mehmet II at the Battle of Vaslui and was the only ruler of Moldavia to have the epithet (*) "the Great."
The biography of one ruler of this name was written by Hartvic and told of a monk named Mercurius who was given the intact hand of that ruler of this name. In addition to that husband of Giselle of Bavaria, the members of the Nemanjic house that ruled Serbia used this name as part of their regnal name. Another ruler of this name crushed Mehmet II at the Battle of Vaslui and was the only ruler of Moldavia to have the epithet (*) "the Great." The greatest elected king of Poland was a Transylvanian Bathory of this name. This was the name of Arpad family member who converted Hungary to Christianity. Matilda defeated an English ruler of this name during the Anarchy. For 10 points, give this common regnal name which derives from the name of the first Christian martyr.
The biography of one ruler of this name was written by Hartvic and told of a monk named Mercurius who was given the intact hand of that ruler of this name.
Stephen [or Stefan]