Kęstutis was the sole Duke of Trakai from 1342 to 1382 and Grand Duke of Lithuania, believed to rule together with his brother Algirdas, and with his nephew Jogaila.
- Occupation
- sovereign, aristocrat
- Position held
- Grand Duke of Lithuania
- Citizenship
- Grand Duchy of Lithuania
- Born
- 1297
- Died
- August 15, 1382, 1382