Ireland first peopled Phoenicians who came from the shores of the Mediterranean Sea about 1500 before Christian era and brought with them a knowledge of the arts, sciences and literature and extant among the enlightened inhabitants of Egypt and Etruria.
Later it was occupied by Celt which derived from the same Celtic stock which supplied Gaul, Britain and Spain with their original population.
Between the 4th and 7th century AD, Ireland underwent a series of large–scale changes which saw the emergence of new ruling dynasties, as the earlier peoples were pushed on to the background, and the penetration of Christianity into the country.
Ireland was the only nation that received Christianity without shedding blood, which they did in the year 432 AD from the lips of St. Patrick, who was a Gaulish captive, brought into Ireland, with many others as trophies of warm by their conquering legions.
Early history of Ireland