Prince Frederik of Denmark is the heir apparent to the Danish throne. Born on May 26, 1968, he is the eldest son of Queen Margrethe II and Prince Henrik. Frederik studied political science and has served in the Danish military, gaining experience in various roles. He married Mary Donaldson, an Australian native, in 2004, and they have four children: Prince Christian, Princess Isabella, and twins Prince Vincent and Princess Josephine. Prince Frederik is known for his involvement in charitable work and sports, particularly in sailing and running, reflecting his commitment to both public service and personal interests.