Duke Theodore Rostislavich nicknamed Theodore the Black (c. 1230s – 1298), Феодор Ростиславич Чёрный (Чёрмный) or Fyodor the Black in Russian (Fyodor or Fedor being the Russian version of Theodore), is a saint of the Russian Orthodox Church and was a ruler of Smolensk and Yaroslavl. The alternative interpretation of his nickname is Theodore the Beautiful.