"Duchy of Croatia" (Croatian: Kneževina Hrvatska; also "Duchy of the Croats", Kneževina Hrvata; "Dalmatian Croatia", Dalmatinska Hrvatska; "Littoral Croatia", Primorska Hrvatska; Greek: Χρωβατία, Chrovatía), was a medieval Croatian duchy that was established in the former Roman province of Dalmatia. Throughout its time it had several seats, namely Klis, Solin, Knin, Biaći and Nin, comprised the littoral, or coastal part of today's Croatia and included a big part of the mountainous hinterland. The Duchy was in the center of competition between the Carolingian Empire and the Byzantine Empire for rule over the area. Rivalry with Venice emerged in the first decades of the 9th century and was to continue for the following centuries. Croatia also waged battles with the Bulgarian Empire, with who