Simeon Borisov of Saxe-Coburg and Gotha or Simeon II of Bulgaria (born 16 June 1937) is an important political and royal figure in Bulgaria. During his reign as the Tsar of Bulgaria from 1943 to 1946 he was a minor, the monarchical authority being exercised over the kingdom on his behalf by a regency. The regents were Simeon's uncle Prince Kiril of Bulgaria, General Nikola Mihov and the prime minister, Bogdan Filov. In 1946 the monarchy was overthrown as a consequence of a greatly manipulated referendum won by the communist republicans. Simeon went into exile. Fifty-five years later, on 6 April 2001, Simeon resumed the role of leader of the nation upon taking office as Prime Minister of the Republic of Bulgaria from July 2001 until August 2005.