Stefan Stambolov (1854–1895) served 1886-1894 to start with as regent and after that key minister for the new ruler, Ferdinand I of Bulgaria (prince 1887–1908, tsar 1908–1918). Stambolov thought that Russia's liberation of Bulgaria from Turkish rule had been an try by Czarist Russia to turn Bulgaria into its protectorate. https://bulgaria36925.targetblogs.com/30432660/detailed-notes-on-bulgaria