Irish Canadians
The first waves of Irish immigrants took place between 1763 and 1880. when ten thousand Irish immigrants arrived on the Island. From 1800 to 1850, "10,000 immigrants from every county in Ireland" had settled in Prince Edward Island and represented 25% of the Island population by 1850.
History of Dublin to 795
In Ireland the commencement of the Iron Age around 600 BC is generally believed to coincide with the first appearance in this country of Celtic-speaking peoples. There is little archaeological evidence to support the theory of a large-scale Celtic invasion (or series of invasions), but it is quite possible that small groups of migrants, highly skilled in the art of war and armed with superior iron weaponry, were powerful enough to gain a foothold in the island and eventually succeeded in subjugating or absorbing the pre-Celtic natives; in the 12th century of the Common Era small bands of heavily armed Anglo-Normans did just this, so there is no conceivable reason why it could not also have happened in the pre-Christian era.