The White Croat conquest of Dalmatia or Croat-Avar war refers to the early 7th century mass migration and settlement of early Slavic White Croats (ancestors of modern South Slavic Croats in the region) to the Roman province of Dalmatia in present-day Croatia and Bosnia and Herzegovina, and successful war against the Pannonian Avars. It resulted in the founding of the Duchy of Croatia and Croatian baptism into Christianity. This event plays an important role in the history of Croatian origin hypotheses.