Sea levels were lower and Ireland, like Great Britain, formed part of continental Europe.By 16,000 BC, rising sea levels due to ice melting caused Ireland to become separated from Great Britain.For other uses, see Ireland (disambiguation).) is an island in the North Atlantic.
These Mesolithic communities lived as hunter-gatherers across the island until about 4000 BC.
From about 4000 BC, Neolithic settlers arrived introducing cereal cultivars, domesticated animals such cattle and sheep, large timber building, and stone monuments.
This theory draws on the Lebor Gabála Érenn, a medieval Christian pseudo-history of Ireland along with the presence of Celtic culture, language and artefacts found in Ireland such as Celtic bronze spears, shields, torcs and other finely crafted Celtic associated possessions.
The theory holds that there were four separate Celtic invasions of Ireland.
This subsided following a political agreement in 1998.
In 1973 the Republic of Ireland joined the European Economic Community while the United Kingdom, and Northern Ireland, as part of it, did the same.
Field systems were developed in different parts of Ireland, including at the Céide Fields, that has been preserved beneath a blanket of peat in present-day Tyrawley.
An extensive field system, arguably the oldest in the world, consisted of small divisions separated by dry-stone walls.
Irish culture has had a significant influence on other cultures, especially in the fields of literature.