The Trubetskoy family (English), Трубецкой (Russian), Трубяцкі (Belarusian), Trubecki (Polish), Trubetsky (Ruthenian), Трубецький (Ukrainian), Troubetzkoy (French), Trubezkoi or Trubetzkoy (German), is a Ruthenian Gediminid gentry family of Black Ruthenian stock, like many other princely houses of Grand Duchy of Lithuania, later prominent in Russian history, science, and arts. They are descended from Algirdas's son Demetrius I Starshy (1327 – 12 August 1399 Battle of the Vorskla River). They used the Pogoń Litewska coat of arms and the Trubetsky coat of arms.