Simeon Borisov Saxe-Coburg-Gotha (or Sakskoburggotski) is a Bulgarian politician and former monarch. During his reign as Simeon II, King (or Tsar) of Bulgaria, from 1943 to 1946 he was a minor, the royal authority being exercised over the kingdom on his behalf by a regency. The regents were Simeon's uncle Prince Kiril, General Nikola Mihov and the prime minister, Bogdan Filov. In 1946 the monarchy was overthrown as a consequence of a referendum, and Simeon was forced into exile. He returned to his home country in 1996, formed the political party National Movement for Stability and Progress and became Prime Minister of the Republic of Bulgaria from July 2001 until August 2005, in the next elections he, as a leader of NDSV, took part in a coalition government with the ex-communist party BSP, and in 2008 after NDSV could not get into Parliament he left politics.
As of 2015, Simeon was one of the three last living heads of state from the time of World War II (the others were former King Michael of Romania and Tenzin Gyatso, 14th Dalai Lama of Tibet), the only living person who has borne the title "Tsar", and as a former monarch, one of only two monarchs in history to have become the head of government through democratic elections (Norodom Sihanouk of Cambodia is the other).