Having ascended Monaco's throne in 1949, the head of the Grimaldi family is currently the world's longest-reigning ruler. Find out more about him and see his photograph.

View images of the world's longest reigning royal, Monaco's monarch, as well as his princess, Grace Kelly, and their children Caroline, Andrew, and Stephanie.

See the proud grandfather with his youngest granddaughter, Alexandra, soon after recovering from his February 2000 lung surgery.

Learn about the prince's lineage and duties, and get the dates of his birth, ascension and marriage. Find out his grandchildren's names.

Examine the many and varied accomplishments that stem from the initiative of the prince during his half-century reign.

Columnist Cecil Adams explains why this monarch can't become a king, and describes the history of relations between France and Monaco.