Eudokia Baïana (Greek: Εὐδοκία Βαϊανή; died 12 April 901) was a Byzantine empress consort as the third wife of Leo VI the Wise.
The Opsician Theme was originally composed of all of Bithynia and Paphlagonia, stretching from Abydos on the Hellespont to Sinope on the Black Sea and inland to Ancyra.
De Ceremoniis by Constantine VII names as many as three daughters born of the previous marriages but no son.
George Alexandrovič Ostrogorsky points that a third marriage was technically illegal under Byzantine law and against the practices of the Eastern Orthodox Church at the time.
Leo VI had to seek permission by Ecumenical Patriarch Antony II of Constantinople.