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As well as being a Christian state it then later became Catholic (the Slavs were pagans upon arrival in Roman Dalmatia). King Demetrius Zvonimir (1075-1089) took an oath of allegiance to Pope Gregory VII. It’s written language was Latin and Croatian Glagolitic. The Slavic rulers spoke old Croatian (Slavic) Chakavian. According to the theologian Godescalc a form of Latin was also spoken in the court of Duke Trpmir (Trepimerus)  <ref>Godescalc, ''De Praedestinatione''. He was a Saxon theologian, monk and poet. Gottschalk was at Trpimir I court between 846 and 848.</ref>.  

As well as being a Christian state it then later became Catholic (the Slavs were pagans upon arrival in Roman Dalmatia). King Demetrius Zvonimir (1075-1089) took an oath of allegiance to Pope Gregory VII. It’s written language was Latin and Croatian Glagolitic. The Slavic rulers spoke old Croatian (Slavic) Chakavian. According to the theologian Godescalc a form of Latin was also spoken in the court of Duke Trpmir (Trepimerus)  <ref>Godescalc, ''De Praedestinatione''. He was a Saxon theologian, monk and poet. Gottschalk was at Trpimir I court between 846 and 848.</ref>.  

The medieval state borders have been a matter of huge debate and will remain so until new historical evidence is found (please read: Early Medieval Boundaries in Dalmatia/Croatia (8th–11th centuries) by Neven Budak <ref>Early Medieval Boundaries in Dalmatia/Croatia (8th–11th centuries)by Croatian Historian Neven Budak. Historian and professor at the Faculty of Humanities and Social Sciences, University of Zagreb. Link: https://www.academia.edu/11534976/Early_medieval_boundaries_in_Dalmatia_Croatia_8th_11th_centuries_ </ref>). However there is some factual information. Medieval Croatia incorporated Lower Pannonia (also ruled by Slavs). The river Cetina was a major border in the south. The [[Dalmatian Italians#Early History|Roman cities]] of '''Jadera''' (Zara/Zadar), '''Spalatum''' (Spalato/Split), '''Ragusa''' (Dubrovnik) and '''Trau''' (Trogir) with their surrounding areas never became part of the state other than for a short period under Peter Kresimir IV. Other parts of the Dalmatian coast did. At times in the north the river Sava was a major border (Lower Pannonia). The region south of the river Cetina has been sometimes historically referred to as Red Croatia,<ref>[http://books.google.com.au/books?id=wEF5oN5erE0C&pg=PA62&dq=V.+Klaić+Red+Croatia+John+Fine&hl=en&sa=X&ei=8RbkUN3YJ4iZkAW4lIGIAw&sqi=2&ved=0CDMQ6AEwAA#v=onepage&q=V.%20Klaić%20Red%20Croatia%20John%20Fine&f=false  When Ethnicity Did not Matter in the Balkans:]  by John Van Antwerp Fine. (p62-p63)

The medieval state borders have been a matter of huge debate and will remain so until new historical evidence is found (please read: Early Medieval Boundaries in Dalmatia/Croatia (8th–11th centuries) by Neven Budak <ref>Early Medieval Boundaries in Dalmatia/Croatia (8th–11th centuries) by Croatian Historian Neven Budak. Historian and professor at the Faculty of Humanities and Social Sciences, University of Zagreb. Link: https://www.academia.edu/11534976/Early_medieval_boundaries_in_Dalmatia_Croatia_8th_11th_centuries_ </ref>). However there is some factual information. Medieval Croatia incorporated Lower Pannonia (also ruled by Slavs). The river Cetina was a major border in the south. The [[Dalmatian Italians#Early History|Roman cities]] of '''Jadera''' (Zara/Zadar), '''Spalatum''' (Spalato/Split), '''Ragusa''' (Dubrovnik) and '''Trau''' (Trogir) with their surrounding areas never became part of the state other than for a short period under Peter Kresimir IV. Other parts of the Dalmatian coast did. At times in the north the river Sava was a major border (Lower Pannonia). The region south of the river Cetina has been sometimes historically referred to as Red Croatia,<ref>[http://books.google.com.au/books?id=wEF5oN5erE0C&pg=PA62&dq=V.+Klaić+Red+Croatia+John+Fine&hl=en&sa=X&ei=8RbkUN3YJ4iZkAW4lIGIAw&sqi=2&ved=0CDMQ6AEwAA#v=onepage&q=V.%20Klaić%20Red%20Croatia%20John%20Fine&f=false  When Ethnicity Did not Matter in the Balkans:]  by John Van Antwerp Fine. (p62-p63)

  John V. A. Fine Jr: {{quote|

  John V. A. Fine Jr: {{quote|

''F. Rački and V. Klaić think these Croats may have operated not only along the coast but inland as far east as what is now Kosovo, intermixed with Serb or other Slavic tribes...'' }}</ref>  which would indicate Croatian influence/settlement was beyond the river Cetina. The Kingdom's borders were further expanded by Prince/King Tomislav and other rulers.  

''F. Rački and V. Klaić think these Croats may have operated not only along the coast but inland as far east as what is now Kosovo, intermixed with Serb or other Slavic tribes...'' }}</ref>  which would indicate Croatian influence/settlement was beyond the river Cetina. The Kingdom's borders were further expanded by Prince/King Tomislav and other rulers.