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Ulster (Irish: Ulaidh or Cúige Uladh, Ulster Scots: Ulstèr or Ulster) is one of the provinces of Ireland, located in the north of the island. In ancient Ireland, it was one of the fifths (Irish: cúige) ruled by a rí ruirech, or "king of over-kings". The definition of the province was fluid from early to medieval times. It took a definitive shape in the reign of King James I of England when all the counties of Ireland were eventually shired. This process of evolving conquest that had been underway since the Norman invasion of Ireland, particularly as advanced by theCambro-Norman magnates Hugh de Lacy and John de Courcy. Ulster was a central topic role in the treaty in the parliamentary debates that eventually resulted in the Government of Ireland Act 1920. Under the terms of the Act, Ireland was divided into two territories, Southern Ireland and Northern Ireland with the border passing through the province. "Southern Ireland" was to be all of Ireland except for "the parliamentary counties of Antrim, Armagh, Down, Fermanagh,Londonderry and Tyrone, and the parliamentary boroughs of Belfast and Londonderry [the city of Derry]" which were to constitute "Northern Ireland". The area of Northern Ireland was seen as the maximum area within which Unionists could be expected to have a safe majority. This was in spite of the fact that countiesFermanagh and Tyrone had Catholic Nationalist majorities. While these six counties and two parliamentary boroughs were all in the province of Ulster, three other counties of the province – Cavan, Donegal and Monaghan – were assigned to the Irish Free State. Ulster has a population of just over 2 million people and an area of 21,552 square kilometres (8,321 sq mi). Its biggest city, Belfast, has an urban population of over half a million inhabitants, making it the second-largest city in Ireland and the 10th largest urban area in the UK. Six of Ulster's nine counties, Antrim,Armagh, Down, Fermanagh, Londonderry and Tyrone, including the former parliamentary boroughs of Belfast and Londonderry, form Northern Ireland which remained part of the United Kingdom after the partition of Ireland in 1921. Three Ulster counties – Cavan, Donegal and Monaghan – form part of the Republic of Ireland. About half of Ulster's population lives in counties Antrim and Down. Across the nine counties, according to the aggregate UK 2011 Census for Northern Ireland, and Irish 2011 Census for counties Cavan, Donegal and Monaghan, there is a slim Catholic majority over Protestant (50.8% against 42.7%). While the traditional counties continue to demarcate areas of local government in the Republic of Ireland, this is no longer the case in Northern Ireland. Since 1974, the traditional counties have a ceremonial role only. Local government in Northern Ireland is today demarcated by 26 districts.