Royal dynasties are families that rule over a kingdom or empire, often passing power from one generation to the next. These dynasties can shape the history, culture, and politics of a region. Examples include the House of Windsor in the United Kingdom and the Ming Dynasty in China. Dynasties often establish their authority through lineage, claiming descent from a notable ancestor or deity. They may also expand their influence through marriage alliances, military conquests, or political maneuvering. The rise and fall of dynasties can significantly impact the course of history, leading to changes in governance and societal structure.