The British Iron Age is a conventional name used in the archaeology of Great Britain, referring to the prehistoric and protohistoric phases of the Iron Age culture of the main island and the smaller islands, typically excluding prehistoric Ireland, which had an independent Iron Age culture of its own.

The tribes living in Britain during this time are often popularly considered to be part of a broadly Celtic culture, but in recent years this has been disputed. At a minimum, “Celtic” is a linguistic term without an implication of a lasting cultural unity connecting Gaul with the British Isles throughout the Iron Age.

The Brythonic languages spoken in Britain at this time, as well as others including the Goidelic and Gaulish languages of neighbouring Ireland and Gaul respectively, certainly belong to the group known as Celtic languages. However, it cannot be assumed that particular cultural features found in one Celtic-speaking culture can be extrapolated to the others.

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