According to the Chronicle of the Priest of Dioclea from the late 12th century, Tomislav of Croatia defeated the Hungarians in battle. Others question the reliability of this account, because there is no proof for this interpretation in other records. Slavonia should have been an integral part of the medieval Croatian state, if the battle had happened, however according to the Byzantine ruler Constantine Porphyrogenitus Slavonia was clearly under Hungarian control. The exact place and time of the battle is not known.