Professor Thadeus O’Mahony (1822-1903), Ballineen, West Cork, Church of Ireland Minister, Professor of Irish at Trinity College Dublin (1861-79), Botanist, and the Brehon Law Commission in the 1850s with Dr. John O’Donovan. His father was Cornelius O’Mahony Gentleman. He married Annabella Geoghegan of Rathmines daughter of Henry in 1856. The same year he was Treasurer of the Ossianic Society in TCD and the O’Donovan Rossa/James Stephens Connection

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