Dmytro Dedko

Dmytro Dedko (died 1349) was a Galician boyar who emerged as ruler of Ruthenia after Bolesław Jerzy II died in 1340. At first he acknowledged Casimir the Great of Poland as overlord and ruled as starosta, but soon turned against the Polish garrisons and, with Lithuanian and Tatar support, raided Lublin in the winter of 1340–1341 until defeated on the Vistula.

In 1341 he wrote to Toruń to restore trade with Halych. He died in 1349, after which Casimir occupied Halych.