John IV Doukas Laskaris (or Ducas Lascaris) (Greek: Ιωάννης Δ΄ Δούκας Λάσκαρις Iōannēs IV Doukas Laskaris) (December 25 1250 – c. 1305) was emperor of Nicaea from August 18 1258 to December 25 1261. This empire was one of the Greek states formed from the remaining fragments of the Byzantine Empire after the capture of Constantinople by Western European Christians during the Fourth Crusade in 1204. John was a son of Theodore II Doukas Laskaris and Elena of Bulgaria.
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