 He was a grandson -through his mother- of Barisone II of Arborea.He is often known as "Ugone de Bas" in Italian, Bas being the common denomination for the viscounty of Besalú.He ascended to the throne of Arborea in 1185 when he was only seven years old, under the regency of Ramon de Torroja, the brother in law of Agalbursa, through her sister Gaia.