The island of Ireland historically consists of 32 counties, of which six, collectively known as Northern Ireland, have remained as part of the United Kingdom since the rest of Ireland gained independence in 1922. The name "Ireland" applies to the island as a whole, but in English is also the official name of the independent state (i.e., the 26 counties which are not part of the United Kingdom), since 1921.
Celtic tribes settled on the island in the 4th century B.C. Invasions by Norsemen that began in the late 8th century were finally ended when King Brian Boru defeated the Danes in 1014. Norman invasions began in the early 12th century and set in place Ireland's uneasy position within England's sphere of influence.
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