Prince Guillaume Henri André Jean Rainier Marie was born on September 02, 1976 in Paris (France). He is the son of Prince Jean and Princess Anne.
After his baccalaureate, the Prince entered military school. He served for 15 years in the engineer regiment before retiring from military life and moving to Copenhagen (Denmark).
Prince Guillaume has been married since 2013 to Astrid Vestergaard.
The princely couple have a son, Prince Luka (2022).