Bernadette Devlin stood for Independent Unity and was pitted against Anna Forrest of the Unionist Party, who was the widow of former MP George Forrest. There was a 91.5% electoral turnout and Devlin was elected with a majority of 4,211. She was the youngest woman ever elected to Westminster and was thrust into the glare of the world's media.
The accompanying photograph shows Bernadette Devlin being filmed for the RTÉ Television programme Féach, in April 1969.
The photographer was Peter Dorney.
© RTÉ Stills Library 2143/001
The election for Mid Ulster's Westminster seat saw the first straight contest between two women in Northern Ireland politics and was labelled "the petticoat election" by the media.
Seán Duignan introduces a report from Don McManus in Moneymore, Derry, where a meeting in support of Bernadette Devlin is disrupted by supporters of Ian Paisley.
Bernadette Devlin addresses supporters at Draperstown, Co. Derry, where she identifies the enemy as the Ulster Unionist Party and not the ordinary working man who differs in religion.
On the day of the election, Don McManus reports from Cookstown, Co. Tyrone, for the lunchtime news.
On polling day, candidate Bernadette Devlin talks to Don McManus having cast her vote for the first time in an election.
Sean Duignan and Andy O'Mahony report on the election of 21-year-old Bernadette Devlin as MP for Mid-Ulster. A tired Devlin declares that, "People of Mid Ulster, we have finally started to overcome."
An exhausted Bernadette Devlin tries to articulate her plans following victory in the Mid-Ulster by-election.
Bernadette Devlin answers questions about her appeal to Protestant voters and fields accusations of being a communist or just an ambitious young girl.
Bernadette Devlin is welcomed at a victory rally in Carrickmore, Co. Tyrone.
Newly-elected MP Bernadette Devlin describes what she saw in the Bogside and expresses her fears of a civil war in Northern Ireland.
John Bowman reviews the events of the past year in Northern Ireland and reflects on the election of Bernadette Devlin, who he describes as "the most extraordinary politician of the year."