Noble titles in Portugal have a long history, primarily influenced by the Portuguese monarchy. The main titles include Duke, Marquis, Count, Viscount, and Baron. These titles were often granted by the king to reward loyalty, military service, or significant contributions to the realm. The nobility played a crucial role in Portuguese society, especially during the Age of Discoveries. While many noble titles have lost their political power over time, they still hold cultural significance and are often associated with historical families and estates throughout Portugal.