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In page Irish diaspora:

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The dispersal of the Irish has been mainly to Britain or to countries colonised by Britain. England's political connection with Ireland began in 1155, when Pope Adrian IV issued a papal bull (known as Laudabiliter), which gave Henry II permission to invade Ireland as a means of strengthening the papacy's control over the Irish Church. That was followed in 1169 by the Norman invasion of Ireland, which was led by the general Richard de Clare, or Strongbow.[citation needed]