John O'Brien (bishop)
O'Brien appealed to the Pope for financial assistance in compiling an Irish-English dictionary. He argued the dictionary was needed for the preservation of Catholicism in Ireland, primarily for the use of young priests beginning their work there. Focaloir Gaoidhilge-Sax-Bearha or 'The Irish-English Dictionary' was published in 1768.
- Lee, Sidney, ed. (1895). "O'Brien, John". Dictionary of National Biography 41. London: Smith, Elder & Co.
-  O'Brien at Ricorso
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