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First king of Croatia, united Pannonian and Dalmatian Croatia.
Tomislav was crowned the first king of Croatia by Pope John X. His coronation established the Kingdom of Croatia and recognized his authority over both Pannonian and Dalmatian Croatia.
Tomislav united the duchies of Pannonian Croatia and Dalmatian Croatia under his rule. This unification created a single Croatian state for the first time, laying the foundation for the medieval Kingdom of Croatia.
Tomislav defeated the Bulgarian Empire under Tsar Simeon I in the Battle of the Bosnian Highlands. This victory prevented Bulgarian expansion into Croatia and secured Croatian independence.