Abbey Street, Dublin, on 3 February 1766. Leabhar na nGenealach was purchased by Robert Jocelyn (who became 1st Earl of Roden in 1771) for £7.1.0. For much of the next hundred and fifty years, it was placed at the Jocelyn family home of Tollymore House, Newcastle, County Down, who were in part descended through a female line from the local Magennis clan. During this time extensive use of Leabhar na nGenealach was made by Charles O'Conor (1770s), Thady Connellan (1830s), John O'Donovan (MacCarrick's version) and Eugene O'Curry, who transcribed in between March 1836 and February 1837. Upon the death of William Henry Jocelyn, 6th Earl of Roden in 1911, it was included in a list of items sold to cover his death duties. The auction was held at Sotheby's of London on 10 November 1911, and the manuscript was purchased by Dublin physician Dr Michael F. Cox, for £79.00. Cox died on 20 February 1926, and his son, Dublin solicitor Arthur Cox, oversaw his father's bequest of the manuscript to University College Dublin on 23 March 1926, "to be perpetually preserved in its library." During the 20th century, it was consulted by various scholars, including Eoin MacNeill, Eleanor Knott, and Father Paul Walsh. The study by Ó Muraíle commenced in 1971; this process ended with its publication in five volumes by De Burca books in 2004. Personal life There are no substantial surviving details of Dubhaltach's personal life. It is unknown whether he married or ever had children. His brothers were Padraig (fl. 1663), Diarmaid, and Seamus (fl. 1656) but no sisters are mentioned. Nor does he record the year his father died, or even his mother's name. During the 1690s, one "Dudley Forbissy, Ardneere, clerk, commonly called Prior of the Abbey of Ardnaree" appears on a list of persons "Outlawed for Foreign Treason". However, the precise identity of this Father Dubhaltach Mac Fhirbhisigh of the Order of St. Augustine is not known. In 1842, a letter (dated 15 August 1842, Dublin) was received by the Royal Irish Academy from one John Mac Firbis, a farmer, "in a humble state of poverty," from the parish of Lackan, County Sligo. He stated that he was "fifth in descent from the younger and only brother [sic] of Duald Mac Firbis," that, "the sisters of the said Duald ... retired into Spain, where they ended their lives in a convent." Having been informed