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They settled the British Isles, they spoke celtic languages, like Welsh and Scottish Gaelic. Some words that come from their language are seagull (gaviota)...
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They gave Latin names, like London... Because they spoke Latin.
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They were the first people that spoke English, and they brought English to the British Isles, and their language was old English. There are some words that they brought like love and green.
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The vikings came from Denmark and Norway. They spoke a different language that developed into norwegian and Danish, some words in English that are from this tribe are cake and skirt.
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They spoke an earlier version of French, so French became very important in England. Some words are bacon and joy.