The constitution was approved by the DÂil Âireann and voters in a plebiscite.
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Celtic tribes arrived on the island between 600 and 150 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 12th century and set off more than seven centuries of Anglo-Irish struggle marked by fierce rebellions and harsh repressions. The Irish famine of the mid-19th century saw the population of the island drop by one third through starvation and emigration. For more than a century after that the population of the island continued to fall only to begin growing again in the 1960s.