Ulster formed one of the historical provincess of Ireland. Two thirds of Ulster (comprising the counties of Antrim, Armagh, Londonderry, Down, Fermanagh, and Tyrone) currently form part of the United Kingdom of Great Britain and Northern Ireland. The Unionist part of the population of Northern Ireland frequently refers to this area as 'Ulster'.
In the 1600s Ulster functioned as the last redoubt of the traditional Gaelic way of life, and following the defeat of the Irish forces at the battles of Kinsale (1601), Mountjoy and Dunboy Castle, Elizabeth I succeeded in subjugating Ulster and all of Ireland.
The name Ulster also appears in some other contexts originally named in honour of the Irish province:
- Ulster, Pennsylvania, United States of America
- Ulster County, New York, United States of America
- Ulster Park, New York, United States of America
An ulster is a kind of overcoat.