The first evidence of human presence in Ireland dates to around 33,000 years ago, with further findings dating the presence of homo sapiens to around 10,500 to 7,000 BCE. The receding of the ice after the Younger Dryas cold phase of the Quaternary around 9700 BCE, heralds the beginning of Prehistoric Ireland, which includes the archaeological periods known as the Mesolithic, the Neolithic from about 4000 BCE and the Copper Age beginning around 2500 BCE with the arrival of the Beaker Culture. The Irish Bronze Age proper begins around 2000 BCE and ends with the arrival of the Iron Age of the Celtic Hallstatt culture, beginning about 600 BCE. The subsequent La Tène culture brought new styles and practices by 300 BCE.

The Anglo-Norman invasion of Ireland took place during the late 12th century, when Anglo-Normans gradually conquered and acquired large swathes of land from the Irish, over which the kings of England then claimed sovereignty, all allegedly sanctioned by the papal bull Laudabiliter. At the time, Gaelic Ireland was made up of several kingdoms, with a High King claiming lordship over most of the other kings. The Anglo-Norman invasion was a watershed in Ireland's history, marking the beginning of more than 800 years of direct English and, later, British, conquest and colonialism in Ireland.