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The Celts come to Ireland. They impose their language and culture, and the majority of the population is remaining today.
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Ireland is converted to a Christian nation by St. Patrick and Christian from Britain.
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The Vikings settle in Ireland, and the King of Leinster want to take back the power of the country.
In that basis, Norman and British settlers take over the land. -
The old Gaelic society is destroyed. Ireland is taken over by British, protestant settlers.