The Nuttall Encyclopedia
O'brien, William Smith
Irish patriot; entered Parliament in 1826; sat for Limerick from 1835 to 1843, when he joined the Repeal Association under O'Connell, but separated from it; joined the physical force Young Ireland party, and became the head; attempted an insurrection, which failed, and involved him in prosecution for treason and banishment for life; a free pardon was afterwards granted on promise of abstaining from all further disloyalty; he died at Bangor, in North Wales (1803-1864).
Wood, James, ed. Entry for 'O'brien, William Smith'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/o/obrien-william-smith.html. Frederick Warne & Co Ltd. London. 1900.