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In the third episode of the series, the program looks at the slow collapse of the Roman Empire saw the arrival of new cultures which threatened the Celts. The program claims that the British king, Vortigern, invited the Anglo Saxons into Britain to help fight the Picts but they betrayed his trust and gradually took over the island.

The Celts were the first European people north of the Alps to rise from anonymity. This program looks at who the Celts were, where they came from and what made their culture so distinctive.

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