March 20, 1761Robert Simms, a Founder of the United Irishmen and Proprietor of the Northern Star, Is Born
March 20, 1780The Firm of James Watt and Co Was Established to Manufacture the Worlds First Duplicating Machines.
March 20, 191460 Cavalry Officers at the Curragh Resign Their Commissions an Incident Known as the Curragh Mutiny
March 20, 1920Tomás MacCurtain, Lord Mayor of Cork for Sinn Féin and Inventor of the Famous Flying Column, Is Killed by Black & Tans
March 20, 1927The Lion, Known as of Cairbre, Used to Introduce Metro-Goldwyn-Meyer Films, Born in Dublin