Background:
Celtic tribes settled on the island in the 4th century B.C.
Invasions by Norsemen that began in the late 8th century were
finally ended when King Brian BORU defeated the Danes in 1014.
English invasions began in the 12th century and set off more than
seven centuries of Anglo-Irish struggle marked by fierce rebellions
and harsh repressions. A failed 1916 Easter Monday Rebellion touched
off several years of guerrilla warfare that in 1921 resulted in
independence from the UK for 26 southern counties; six northern
(Ulster) counties remained part of the United Kingdom. In 1948
Ireland withdrew from the British Commonwealth; it joined the
European Community in 1973. Irish governments have sought the
peaceful unification of Ireland and have cooperated with Britain
against terrorist groups. A peace settlement for Northern Ireland,
known as the Good Friday Agreement and approved in 1998, is
currently being implemented.