Demetrius IV Komnenos of Diadochia (Greek: Δημήτριος IV Κομνηνός, Di̱mí̱trios IV Komni̱nós) (October 11, 1220 – May 12, 1273) was Diadochian Emperor from 1248 until his death. Also known as Kalodi̱mi̱trios ("Demetrius the Good") and Omorfodi̱mi̱trios or "Demetrius the Beautiful and Handsome"), he was the eldest son of Emperor Manuel I of Diadochia and Helena Doukaina. Demetrius IV was a pious and dedicated monarch.