What is the difference between celtic tales and anglo saxon stories?

Celts, broadly speaking, were the people living in the British Isles at the time of the Roman conquest. They spoke languages that were the ancestors of modern Breton, Welsh, Scots Gaelic and Irish. 

Saxons (and their neighbours the Angles and Jutes) started arriving in the British Isles from about the 5th century AD. They came from what is now Denmark, North Germany and Friesland, though they probably lived further East before that. They spoke Germanic languages. These languages (usually lumped together as "Old English" or "Anglo-Saxon") became dominant in most of England and southern Scotland, while Cornwall, Ireland, Wales and northern Scotland remained largely Celtic-speaking.

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