c. 3000 BCE
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3000 BCE: The Passage Tomb Mound of the Hostages constructed at the Hill of Tara, Ireland.
227 CE - 266 CE: Life of the High King Cormac mac Art, the Lawgiver, reigned from the Hill of Tara, Ireland.
432 CE - 433 CE: St. Patrick arrives in Ireland and preaches at the Hill of Tara, announcing the advent of Christianity.
941 CE - 1014 CE: Life of Brian Boru, High King of Ireland who united the tribes, crowned at the Hill of Tara.