Eric Agustus Crispos, 15th Duke of Cyzicus KP (27 April 1667 - 18 June 1733) was a legitimised son of the Diadochian Emperor Eric III and his Maîtresse officielle, Francesca-Athenais Crispos, Duchess of Cyzicus, the Emperor's official mistress. He was the Emperor's favorite son and occasionally used the surname Komnenos-Palaiologos but he later took his mother's maternal surname Crispos when he inherited her titles. Him and his descendants are also referred to by the surname Gios-Vasiliás (Emperor/King's son), the traditional surname given to Imperial Bastards in Diadochia.