Tsar Theodore Svetoslav rules as emperor (tsar) of Bulgaria from 1300 to 1322.

The date of his birth is unknown.

He is a wise and capable ruler who brings stability and relative prosperity to the Bulgarian Empire after two decades of constant Mongol intervention in the internal issues of the Empire.

Theodore Svetoslav's reign begins with the return of Southern Bessarabia to Bulgaria.

A few years later, he manages to defeat the Byzantines and retake most of northern Thrace occupied by them during the crisis.

After 1307, he leads peaceful policy towards all neighbors, which results in expanded trade and economy.

Apart from his external and economic successes, Theodore Svetoslav deals with the separatists among the nobility, including his uncle.

He persecutes the traitors who he thinks were responsible for the Mongol interference and even the Patriarch, Joakim III, is executed.