Counties of Northern Ireland
Northern Ireland is divided into six counties, namely: Antrim, Armagh, Down, Fermanagh, Londonderry and Tyrone. Six largely rural administrative counties based on these were among the eight primary local government areas of Northern Ireland from its 1921 creation until 1973. The other two local government areas were the urban county boroughs of Derry (geographically part of the County of Londonderry) and Belfast (geographically split between the counties of Antrim and Down). The six counties date from the Kingdom of Ireland; five were created between 1570 and 1591 in the Tudor conquest of Ireland, while county Londonderry  dates from 1613 and the Plantation of Ulster. The total number of counties in the island of Ireland is 32, with Northern Ireland and the Republic of Ireland often respectively called "the Six Counties" and "the Twenty-Six Counties", especially by Irish nationalists opposed to the partition of Ireland. The 1898–1973 administrative counties were subdivided into county districts. The two-tier county/district system was replaced with a single-tier of "districts", and rationalised into 11 in 2015. The areas corresponding to the six counties and two county boroughs remain in use for some administrative purposes, and the six historic  counties retain a popular identity. Origins. The English administration in Ireland in the years following the Anglo-Norman invasion of Ireland created counties as the major subdivisions of an Irish province. This process lasted a period from the 13th to 17th centuries; however, the number and shape of the counties that would form the future Northern Ireland would not be defined until the Flight of the Earls allowed the shiring of Ulster from 1604. Each county would have an associated county town, with county courts of quarter sessions and assizes. The area of the modern counties of Antrim and Down  was the Earldom of Ulster based on John de Courcy's 1170s conquest of Gaelic Ulaid. Between the late 13th and early 14th centuries it was subdivided into multiple shires based around centres of Norman power such as Antrim, Carrickfergus, and Newtownards. The Bruce invasion (1315–18) saw the devastation of the Earldom of Ulster and its overlordship over the neighbouring Gaelic districts. With the murder of the last de Burgh earl in 1333, the resulting Gaelic recovery expanded Clandeboy and eroded the earldom's territory until by the 15th century only the areas of Carrickfergus and coastal enclaves in Down  remained. It was not until the reign of Queen Elizabeth I that Ulster would be shired into more counties. After the 1567 death and 1570 attainder of Shane O'Neill, much of Clandeboy was added to the surviving English enclaves to form the new counties of Antrim and Down, preparing for an abortive private English plantation. In 1584, Lord Deputy of Ireland Sir John Perrott created six counties in Ulster, based largely on the boundaries of existing lordships; four of the six are now Northern Ireland: Armagh, Coleraine, Fermanagh, and Tyrone. The noncooperation and later rebellion of Hugh O'Neill, Earl of  Tyrone made Perrott's scheme largely notional until the Nine Years' War ended and the Flight of the Earls allowed the Plantation of Ulster to reinforce the county government. The County of the town of Carrickfergus remained separate from County Antrim until the Local Government (Ireland) Act 1898, which also promoted the boroughs of Belfast and Derry to county boroughs separate from the adjoining administrative counties. Baronies. Each county is divided into a number of baronies, midway between a county and a parish. Baronies are now obsolete as administrative units, partially derived from the territory of an Irish chieftain. By  the time the process of turning local Irish kingdoms into baronies occurred throughout the whole of Ulster by the early 17th century as part of the Plantation of Ulster, it was already being used for taxation and administrative purposes. Baronies were used for many records from the 17th to 19th centuries such as: the Civil Survey; Petty's Down Survey; the Books of Survey and Distribution; the 19th century valuation books and census returns. The Grand Jury representment system would also be based on the barony. Government and modern usage. The counties were also used as the administrative unit of  local government introduced in Ireland under the 1898 Local Government Act along with county boroughs. In regards to Northern Ireland the cities of Belfast and Londonderry became county boroughs. The administrative counties and county boroughs were abolished as local government areas in Northern Ireland in 1972 and replaced with twenty-six unitary councils, many of which cross county boundaries. The six administrative counties and two county boroughs remain in use for some purposes, including car number plates. The six counties were also used as postal counties by the Royal Mail for sorting purposes until their abolition in 1996. Outside government , the counties are used for cultural purposes, for example in the Gaelic Athletic Association. Lieutenancy areas. Like the rest of the United Kingdom, Northern Ireland is divided into lieutenancy areas (see map on right). These are areas that have an appointed Lord Lieutenant—the representative of the British monarch. Northern Ireland has eight lieutenancy areas: The counties of Antrim, Armagh, Down, Fermanagh, Londonderry, and Tyrone; and the cities of Londonderry, and Belfast. These are contiguous with the six administrative counties and two county boroughs, established by the 1898 Local Government Act. Former counties. Former counties which formed part of the  six modern counties of Northern Ireland: