Blue Bloods: Ruling and Royal Families -- PICTURES

GREAT BRITAIN: The Queen Mother appears outside her London home Clarence House in 2001 with other members of the Royal Family for her 101st birthday. From left: great granddaughter Princess Beatrice, son-in-law Prince Phillip, great grandson Prince Harry, daughter Queen Elizabeth II, grandson Prince Charles, great grandson Prince William, great granddaughter Zara Phillips, granddaughter Princess Anne, great granddaughter Princess Eugene, great grandson Peter Phillips, and grandson Prince Andrew. (RICHARD LEWIS/AP)

NORTH KOREA: In this undated photo released last year, North Korean leader Kim Jong Il (right) poses for a group photo with his third son, Kim Jong Un (left). Kim Jong Un supplanted his two older brothers as North Korea's next-in-line. (AP Photo/Korean Central News Agency via Korea News Service, File)

DENMARK: From left: Prince Joachim and his wife Princess Marie with their child Prince Henrik; Crown Prince Frederik with one of the twins, Prince Vincent; Prince Christian; Crown Princess Mary with the other twin, Princess Josephine; Queen Margrethe and Prince Consort Henrik with Princess Isabella; Prince Nikolai; and Prince Felix to the right. In the back row, from left, are Carina Axelsson with her boyfriend Gustav; Prince zu-Sayn-Wittgenstein-Berleburg; and his mother Princess Benedikte. The Danish royal family enjoys approval ratings between 80 and 90 percent. (AP Photo/POLFOTO, Rasmus Flindt Pedersen)

SWEDEN: The Swedish royal family during the Nobel Prize awards ceremony in Stockholm in 2008. From left: Queen Silvia, Princess Madeleine, King Carl XVI Gustaf, Prince Carl Philip, and Crown Princess Victoria. (AP Photo/Scanpix Sweden, Pontus Lundahl)

SAUDI ARABIA: New Saudi King Abdullah bin Abd al-Aziz (center) receives condolences from members of the Saudi royal family before performing special prayers for late Saudi King Fahd at Riyadh's Turk bin Abdullah mosque in 2005. The House of Saud is one of the most powerful and wealthiest ruling families in the world, with 7,000 members. (AMR NABIL/AP)

JAPAN: In this 2010 photo Japan's Emperor Akihito (center left) and Empress Michiko (center right) with Prince Hisahito (fifth from right) as imperial family members gather for the annual official photo session at the Imperial Palace in Tokyo. Also pictured are, from left, Crown Princess Masako, Crown Prince Naruhito, Princess Aiko, Prince Akishino, Princess Kiko, Princess Mako, and Princess Kako. The Japanese monarchy, also called the Yamato Dynasty, is the oldest continuous hereditary monarchy in the world. (IMPERIAL HOUSEHOLD AGENCY/AP)

CUBA: Premier Fidel Castro (left), in an undated photo, sits with his brother Raul. Formerly the commander in chief of the armed forces, Raul took power in 2006 after his brother became ill. He was elected in 2008 after Fidel announced his intention not to run. (AP PHOTO)

BRUNEI: Sultan of Brunei Hassanal Bolkiah (center) offers a prayer with two of his queens -- Hajjah Saleha (left) and Hajjah Mariam -- during the royal birthday investiture ceremony at the Nurul Iman Palace in 2000. Sultan Hassanal Bolkiah, the oldest son of the previous Sultan, remains on top of the list of the world's billionaires. (VINCENT THIAN/AP)

MONACO: This photo released by Monaco palace shows Prince Albert II of Monaco during his enthronement ceremony with his sisters Princess Stephanie of Monaco (left) and Princess Caroline of Hanover in 2005. Albert, part of the House of Grimaldi, is son of Prince Ranier III and Princess Grace. (MONACO PALACE/AP, HANDOUT)