Milutin was succeeded by his son Stefan Dečanski, who maintained his father's kingdom and had monasteries built, the most notable being Visoki Dečani in Metohija (Kosovo), after which he is known in historiography. Visoki Dečani, Our Lady of Ljeviš and the Gračanica monastery, all founded by Dečanski, are part of the "Medieval Monuments in Kosovo", a combined World Heritage Site. After decisively defeated the Bulgarians, Serbia was caught up in an internal war between two groups of the Serbian nobility, one supporting Dečanski, the other supporting his son Stefan Dušan which sought to expand to the south. The struggle ended in 1331, when the old King was forced to abdicate.