François Grimaldi was a notable figure in the history of Monaco. He is best known for founding the Grimaldi family, which has ruled Monaco for over 700 years. In 1297, he disguised himself as a monk to capture the fortress of Monaco, marking the beginning of the family's influence in the region. Grimaldi's actions laid the groundwork for the establishment of the Principality of Monaco. His descendants continued to play significant roles in the governance and development of Monaco, making the Grimaldi family one of the oldest ruling dynasties in Europe.