Rainier III Becomes Prince of Monaco

Date: May 9, 1949 • Location: Rome, Italy

Rainier III became Prince of Monaco, beginning a 56-year reign, which would make him one of the longest ruling monarchs of the 20th century.

Rainier III was Prince of Monaco from 1949 until his death in 2005.

This milestone marked a defining occurrence in Italy's and world history, leaving an indelible imprint on societal development, international relations, and cultural memory. Its enduring ramifications continue to be examined and commemorated by historians and scholars across the globe.