Ireland has historically been divided into five
provinces, the
Irish-language word for this territorial division,
cúige (literally "fifth part"), indicates that there were once five —
Meath (now incorporated into Leinster with parts going to Ulster) being the fifth.
The four provinces are
The origins of these provinces (loosely federated kingdoms with somewhat flexible boundaries) of which there were five in existence prior to the coming of the Normans can be traced to the overriding influence exerted in their respective territories by the great Irish dynastic families of O Neill (Ulster), O Melaghlin (Mide), O Brien (Munster), O Conor (Connacht) and MacMurrough-Kavanagh (Leinster). In the post-Norman period the historic provinces of Leinster and Meath gradually merged, mainly due to the impact of the Pale, which straddled both, thereby forming the present-day province of Leinster. In the Irish Annals these five ancient political divisions were invariably referred to as Cúigí, i.e ‘fifth parts’, such as the fifth of Munster, the fifth of Ulster and so on. Later record-makers, dubbed them ‘provinces’, in imitation of the Roman imperial provinciae.
In modern times they have become associated with groups of specific counties, although they have no legal status. They are today seen in a sporting context, as Ireland's four professional rugby teams play under the names of the provinces, and the Gaelic Athletic Association has separate Provincial councils and Provincial championships.