Pavlos, Crown Prince of Greece
The 55-year-old prince comes from a long line of European royalty on both sides of his parentage. As the son of King Constantine II and Queen Anne-Marie of Greece, he's related to the British, Spanish, and Danish royal families - his father was a cousin of Prince Philip and brother to Queen Sofía of Spain, while mom is the youngest daughter of King Frederick IX of Denmark.
Whew.
A thoroughly modern royal, Pavlos hasn't just coasted by on his crown. He's lived and worked in London and New York as an investment consultant, and founded the "activist hedge fund" (whatever that means) Ortelius Advisors.