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In page Bosnia and Herzegovina:

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A very important role in their life was the cult of the dead, which is seen in their careful burials and burial ceremonies, as well as the richness of their burial sites.[5] In the 4th century BCE, the first invasion of Celts was recorded. They brought the technique of the pottery wheel, new types of fibulas and different bronze and iron belts. They only passed through en route to Greece.[citation needed]