The newly wedded British royal couple of Prince William and Kate Middleton does not have Bulgarian cousins yet as they will be seventh cousins with former Bulgarian Tsar Simeon Saxe-Coburg's future great-grand children.

Simeon Saxe-Coburg, Tsar of Bulgaria in 1943-1946, and Prime Minister of Bulgaria in 2001-2005, together with his wife Margarita Gomez-Acebo y Cejuela are the only Bulgarian representatives invited at the British royal wedding - as Simeon Saxe-Coburg is fourth cousin of Queen Elizabeth II's father, George VI.

The lineage of the British and Bulgarian royal families is traced back to Francis, Duke of Saxe-Coburg-Saalfeld (1750-1806), the patrilineal ancestor of Elizabeth II of Britain, Albert II of Belgium, and Simeon II of Bulgaria, and his wife Auguste.

One of Francis and Auguste's daughters, Victoria, is the mother of British Queen Victoria, who is first cousin with August, son of Ferdinand, one of Francis and Auguste's sons.

Subsequently, August's son became Tsar Ferdinand I of Bulgaria (ruled 1887-1918), who was second cousin with British King Edward VII. Ferdinand's son, Bulgarian Tsar Boris III was third cousin of British King George V.

Boris's son, Simeon II Saxe-Coburg, the last ruling Bulgarian monarch exiled at the age of 9, is King George VI's fourth cousin. Simeon's five children are fifth cousins with Queen Elizabeth II, while his grand children are sixth cousins with Prince Charles.

Simeon Saxe-Coburg's grand children are too young but their descendants will be seventh cousins with Prince William and his wife Kate, or Catherine Middleton, the Duchess of Cambridge,