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In page Republika Srpska:

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With the influx of the Iron Age, the Glasinac culture, developing near Sokolac in eastern Republika Srpska, was one of the most important of the country's long-standing Indo-European inhabitants, the Illyrians. Later, these Illyrians—the Autariatae—were influenced by the Celts after the Gallic invasion of the Balkans.[3]