The "Prince of Portugal" is a title historically associated with the heir apparent to the Portuguese throne. This title has been held by various members of the House of Aviz and later the House of Braganza, which ruled Portugal for centuries. The title signifies the individual who is first in line to become king, playing a crucial role in the royal lineage. In modern times, the title is largely ceremonial, as Portugal is a republic and no longer has a monarchy. However, descendants of the former royal family, such as Dom Duarte Pio, continue to use the title in cultural and social contexts, preserving the history and heritage of the Portuguese monarchy.