Popsugar Celebrity The Royals Prince Charles Facts 70 Things You Never Knew About Prince Charles 8 November 2018 by Corinne Sullivan View On One Page Photo 5 of 10 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 5 17: Day in June of 1968 when he was installed as a Knight of the Garter at Windsor Castle. 18: Number of military regiments he is affiliated to. 19: Number of organisations that comprise The Prince's Charities (18 of which were personally founded by Charles). 20: Number of watercolour paintings of his country estates exhibited at the Florence International Biennale of Contemporary Art in 2001. 20: Day in August of 1971 when he was awarded his Royal Air Force Wings at Cranwell. 21: Age when he received his Aston Martin DB6, which runs on biofuel made from surplus wine. 24: Number of Dukes of Cornwall in British history. Previous Next Start Slideshow The RoyalsThe British RoyalsCelebrity FactsKing Charles III