Crown Prince Frederik of Denmark, born on May 26, 1968, is the heir apparent to the Danish throne. He is the son of Queen Margrethe II and Prince Henrik. Frederik studied political science and has served in the Danish military, gaining experience in various roles. Frederik is married to Crown Princess Mary, an Australian-born former advertising executive. Together, they have four children: Prince Christian, Princess Isabella, and twins Prince Vincent and Princess Josephine. The Crown Prince is known for his involvement in charitable work and his support for various social and environmental causes.