Isabel Marion Weir Johnston

Isabel Marion Weir Johnston (1883–1969), known as Marrion Kelleher (née Johnston), was the first woman to enter Trinity College, Dublin (TCD) in January 1904.

Family DU Elizabethan Society CrestJohnston was born 25 November 1883 in Derry City in Ireland to a Presbyterian family. Her father John Barr Johnston (1843 - 1919) was a knight, a merchant, as well as an alderman, mayor and justice of the peace from Tyrone. Her mother was Isabella Weir from Donegal. She had an older brother, John Alexander, who studied law, an older sister Margaret Chambers who became a secretary and a younger sister Kathleen Maude. In 1901 she applied to the King's Inns, but was rejected by a small majority. The Board voted in favour of allowing women to enter the university in 1902. In 1903, when the Lord Lieutenant said that the Provost's assent was required, Salmon withdrew his formal objections. Coincidentally, immediately after his death on Friday, 22 January 1904, Johnston became the first woman undergraduate to succeed in registering at TCD, and by the end of year other women had done likewise.

Johnston was the first woman to enter TCD where she read English and French. She was followed later the same year by the next women undergraduates, Ellen Tuckey and Avarina Shegog. She founded the women's debating society, The Dublin University Elizabethan Society, in 1905. Although "an active and able student" Johnston left before finishing her degree due to ill health and marriage. Kelleher was the only Roman Catholic Fellow in the university at the time. Kelleher became the Erasmus Smith's Professor of Mathematics in Trinity for 1914-1917. The family later moved to England where Johnston became a founder member of the London branch of the DU Women graduates association.