Fyodor Svyatoslavich

Fyodor Svyatoslavich (c. 1300 – c. 1356), son of the Bryansk prince Svyatoslav Glebovich, was a Rurikid prince who held Rzhev and ruled Vyazma from about 1339 to 1341. He first served Yury Danilovich of Moscow and twice led Muscovite troops against Tver, later serving Gediminas as envoy to Novgorod in 1326.

After Algirdas's campaign of 1341 he lost Vyazma, entered Moscow service as governor of Volok, and in 1345 married his daughter Eupraxia to Prince Simeon the Proud.