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
The Royal Irish Academy has a collection Graves of the papers between Doctor John O’Donovan and Rev Thadeus O’Mahony re the Brehon Law Commission. The eventual editions are now not hugely well regarded but were most important for the commencement os serious study into the topic. There is a Rev. Thadeus O’Mahony prize in TCD.
O’Donovan Rossa refers to his brother:
James O’Mahony of Bandon wrote to me that he wished to meet me to have a talk over Irish national
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