Theodore Svetoslav (Bulgarian: Тодор Светослав, Todor Svetoslav and also Теодор Светослав, Teodor Svetoslav) ruled as emperor (tsar) of Bulgaria from 1300 to 1322. The date of his birth is unknown. He expanded the territory of the Bulgarian Empire. Apart from his external and economic successes, Theodore Svetoslav dealt with the separatists among the nobility including his uncle. He persecuted the traitors who he thought were responsible for the Mongol interference and even the Patriarch, Joachim III, was executed.