476212 Hugh McMahon betraying the secret of the intended massacre to Owen O\'Conolly, illustration from \'John Cassell\'s Illustrated History of England\', published 1858 (engraving) by English School, (19th century); Private Collection; (add.info.: Hugh ?g MacMahon was one of the Catholic leaders of the Irish Rebellion of 1641 in which the Irish Catholic gentry were planning a coup d\'etat by using suprise to seize Dublin Castle. Owen O\'Connolly, a protestant informer, foiled the plot and MacMahon and another leader, Conor Maguire, were arrested.); English, out of copyright.