[2][3] Algirdas's invasion was the first military campaign that a European power launched in the territory of the Golden Horde.
[5] According to the charter, King Louis granted the merchants who came from Demetrius's country an exemption from paying custom duties in the Kingdom of Hungary in exchange for Demetrius's identical grant for the merchants of Brașov who visited the Tatar prince's country.
[5][6] 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.
[7] 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.
[8] His title "princeps" shows that Demetrius was an independent ruler who was not subjected to the Khan of the Golden Horde in 1368.