Ulster Says No was the name of a slogan, campaign and mass protest

Demonstration (people)

A demonstration or street protest is action by a mass group or collection of groups of people in favor of a political or other cause; it normally consists of walking in a mass march formation and either beginning with or meeting at a designated endpoint, or rally, to hear speakers.Actions such as...

 against foreign interference by the Republic of Ireland

Republic of Ireland

Ireland , described as the Republic of Ireland , is a sovereign state in Europe occupying approximately five-sixths of the island of the same name. Its capital is Dublin. Ireland, which had a population of 4.58 million in 2011, is a constitutional republic governed as a parliamentary democracy,...

 in the internal affairs of the United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

, specifically that of Northern Ireland

Northern Ireland

Northern Ireland is one of the four countries of the United Kingdom. Situated in the north-east of the island of Ireland, it shares a border with the Republic of Ireland to the south and west...

. It was led by Unionist

Unionism in Ireland

Unionism in Ireland is an ideology that favours the continuation of some form of political union between the islands of Ireland and Great Britain...

 leader Ian Paisley

Ian Paisley

Ian Richard Kyle Paisley, Baron Bannside, PC is a politician and church minister in Northern Ireland. As the leader of the Democratic Unionist Party , he and Sinn Féin's Martin McGuinness were elected First Minister and deputy First Minister respectively on 8 May 2007.In addition to co-founding...

 in the mid 1980s.

After the signing of the 1985 Anglo-Irish Agreement

Anglo-Irish Agreement

The Anglo-Irish Agreement was an agreement between the United Kingdom and Ireland which aimed to help bring an end to the Troubles in Northern Ireland...

 by Prime Minister

Prime minister

A prime minister is the most senior minister of cabinet in the executive branch of government in a parliamentary system. In many systems, the prime minister selects and may dismiss other members of the cabinet, and allocates posts to members within the government. In most systems, the prime...

 Margaret Thatcher

Margaret Thatcher

Margaret Hilda Thatcher, Baroness Thatcher, was Prime Minister of the United Kingdom from 1979 to 1990...

 and Taoiseach

Taoiseach

The Taoiseach is the head of government or prime minister of Ireland. The Taoiseach is appointed by the President upon the nomination of Dáil Éireann, the lower house of the Oireachtas , and must, in order to remain in office, retain the support of a majority in the Dáil.The current Taoiseach is...

 Garret FitzGerald

Garret FitzGerald

Garret FitzGerald was an Irish politician who was twice Taoiseach of Ireland, serving in office from July 1981 to February 1982 and again from December 1982 to March 1987. FitzGerald was elected to Seanad Éireann in 1965 and was subsequently elected to Dáil Éireann as a Fine Gael TD in 1969. He...

, Unionist leaders stated that the agreement to allow the Republic's government such privileges needed to be put before the people in a referendum and organised a vote in the Northern Ireland Assembly to that effect. Republican party Sinn Féin

Sinn Féin

Sinn Féin is a left wing, Irish republican political party in Ireland. The name is Irish for "ourselves" or "we ourselves", although it is frequently mistranslated as "ourselves alone". Originating in the Sinn Féin organisation founded in 1905 by Arthur Griffith, it took its current form in 1970...

 also objected (albeit for different reasons). In the Irish Parliament, the main opposition party, Fianna Fáil

Fianna Fáil

Fianna Fáil – The Republican Party , more commonly known as Fianna Fáil is a centrist political party in the Republic of Ireland, founded on 23 March 1926. Fianna Fáil's name is traditionally translated into English as Soldiers of Destiny, although a more accurate rendition would be Warriors of Fál...

 also voted against.

A large rally protested the move at Belfast City Hall

Belfast City Hall

Belfast City Hall is the civic building of the Belfast City Council. Located in Donegall Square, Belfast, County Antrim, Northern Ireland, it faces north and effectively divides the commercial and business areas of the city centre.-History:...

. The numbers attending were estimated to be at least 100,000 while Unionist sources estimated over 200,000 in attendance. Paisley and all the other Unionist MPs

Member of Parliament

A Member of Parliament is a representative of the voters to a :parliament. In many countries with bicameral parliaments, the term applies specifically to members of the lower house, as upper houses often have a different title, such as senate, and thus also have different titles for its members,...

 resigned from the British House of Commons

British House of Commons

The House of Commons is the lower house of the Parliament of the United Kingdom, which also comprises the Sovereign and the House of Lords . Both Commons and Lords meet in the Palace of Westminster. The Commons is a democratically elected body, consisting of 650 members , who are known as Members...

 in protest, but all except Jim Nicholson

Jim Nicholson (UK politician)

James Frederick "Jim" Nicholson is a Northern Ireland Ulster Unionist Party politician, who is currently a Member of the European Parliament .-Career:...

 were subsequently re-elected in the resultant by-elections

Northern Ireland by-elections, 1986

The 1986 Northern Ireland by-elections were fifteen by-elections held on 23 January 1986, to fill vacancies in the Parliament of the United Kingdom caused by the resignation in December 1985 of all sitting Unionist Members of Parliament...

.