1866 in Ireland

Events

*14 October - St Peter's Cathedral, Belfast is dedicated, although the building is incomplete.

Births

*5 February - Domhnall Ua Buachalla, member of 1st Dáil, Fianna Fáil TD, last Governor-General of the Irish Free State (d.1963).
*February - Michael Egan, trade unionist, city councillor, and Cumann na nGaedheal TD (d.1947).
*15 June - Charles Wood, composer (d.1926).
*3 December - Ethna Carbery, writer and poet (d.1902).
*December - Thomas Byrne, recipient of the Victoria Cross for gallantry in 1898 at the Battle of Omdurman, Sudan (d.1944).

Full date unknown

*Éamon a Búrc, tailor and seanchaí (d.1942).
*Dora Sigerson Shorter, poet (d.1918).
*Bridget Sullivan, domestic housemaid for Borden family of Fall River, Massachusetts (d.1948).

Deaths

*5 January - Augustus Warren Baldwin, naval officer and political figure in Upper Canada (b.1776).
*4 March - Alexander Campbell, religious leader in Britain and the United States (b.1788).
*26 October - John Kinder Labatt, brewer in Canada (b.1803).
*26 October - Patrick McHale, soldier, recipient of the Victoria Cross for gallantry in 1857 at Lucknow, India (b.1826).

Full date unknown

*Edward Eagar, lawyer and criminal transported to Australia, politician (b.1787).
*Francis Sylvester Mahony, humorist and poet (aka Father Prout), (b.1804).