Revenue stamps of the United Kingdom
When Ireland was partitioned into Northern Ireland and Southern Ireland in 1921, separate revenue stamps were issued for both entities. Southern Ireland stamps saw little use since that political entity was quickly superseded by the Provisional Government of Ireland and later the Irish Free State (both of which applied overprints on various British and Irish revenue stamps). However, Northern Ireland continued to use separate revenue stamps until the 1980s. Northern Irish revenues include Civil Service, Dog Licence, Excise and National Insurance stamps, among many others.
Counties of Northern Ireland
It was not until the reign of Queen Elizabeth I that Ulster would be shired into more counties, based largely on the boundaries of existing lordships. In 1584, Lord Deputy of Ireland Sir John Perrott created the following counties in what is now Northern Ireland: Armagh; Coleraine; Fermanagh; and Tyrone. Carrickfergus would retain its status as a county town until 1777 when it was merged with County Antrim.