Hereditary monarchy in Game of Thrones sees the throne pass from monarch to successor in the ruling families, namely the Targaryens and later, the Baratheons and the Lannisters. Westeros was united into a single political entity by Aegon Targaryen and his sister-wives with fire and blood. They achieved political unification of most of the continent, but one of the Seven Kingdoms, viz, the Principality of Dorne remained independent until the marriage of Princess Daenerys to Maron Martell, held at King's Landing in 187 AC.