The term "Serbian Ruler" typically refers to historical leaders of Serbia, particularly during the medieval period. Notable rulers include Stefan Nemanja, who founded the Nemanjić dynasty in the 12th century, and Stefan Dušan, who expanded the Serbian Empire in the 14th century. These rulers played significant roles in shaping Serbian culture, law, and territorial boundaries. In modern times, the title can also refer to political leaders in Serbia, such as presidents and prime ministers. The governance structure has evolved, with Serbia transitioning from a monarchy to a republic after the fall of Yugoslavia in the 1990s, impacting the role and influence of its rulers.