Royal lineage refers to the line of descent from a monarch or royal family. It typically includes the ancestors and descendants of a king or queen, establishing a family tree that highlights the connections between various members of the royal household. This lineage often determines the rightful heirs to the throne and can influence political power and social status within a nation. In many cultures, royal lineage is traced through specific rules, such as primogeniture, where the firstborn child inherits the throne. Notable examples of royal lineages include the British Royal Family and the House of Windsor, which have played significant roles in their respective countries' histories.