May 10, 1318Richard De Clare, While Defending His Protégé Mahon O'Brien, Is Defeated and Killed by Murrough O'Brien at Dysert O'Dea
May 10, 1642A Catholic Confederacy Is Instituted to Administer Catholic-Controlled Parts of the Country Pending a Final Settlement
May 10, 1804William Pitt Returns to Office Following a Disagreement With George III Over Catholic Emancipation,
May 10, 1838James Bryce, 1st Viscount Bryce of Dechmount; Jurist, Historian and Liberal Politician, Is Born in Belfast
May 10, 1873Leslie Montgomery, Comic Writer; Pseudonym Lynn C. Doyle, Is Born in Downpatrick, Co. Down
May 10, 1967Breath Tests for Motorists Suspected of Drinking and Driving Introduced Under the Road Safety Act