Demetrius, Prince of the Tatars (Latin: Demetrius princeps Tartarorum) was a Mongol, or Tatar, ruler in the second half of the 14th century.
In modern historiography
Historian Virgil Ciocîltan describes Demetrius as the "last magnate of Bujak" who emerged in the period of the disintegration of the Golden Horde in the 1340s. According to historian Laurenţiu Rădvan, Demetrius controlled the land between the upper courses of the rivers Prut and Dniester, including the trading ports on the coast of the Black Sea. His title "princeps" shows that Demetrius was an independent ruler who was not subjected to the Khan of the Golden Horde in 1368.
References
Demetrius, Prince of the Tatars Wikipedia(Text) CC BY-SA