Stephen supported and assisted his elder brother Nicholas' political ambitions and aspirations without questioning. In a charters issued in 1273 he was mentioned as "former" ispán of Vas County concerning Béla IV of Hungary's royal campaign against Moravia in 1260. When Stephen V of Hungary ascended the Hungarian throne in 1270, several prominent partisans of the late Béla IV had fled the kingdom and placed themselves under the protection of Ottokar II of Bohemia. Nicholas and Stephen Geregye handed over the Dobronya Castle at Dobróváralja, Upper Hungary (today Podzámčok, Slovakia) to the Bohemian king.
