Caesar Williamson was Dean of CashelFryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I., eds. (1986). Handbook of British Chronology (3rd, reprinted 2003 ed.). Cambridge: Cambridge University Press. . from 1671"Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 1" Cotton, H. pp36/7 Dublin, Hodges & Smith, 1848–1878 until 1675."A New History of Ireland" T. W. Moody, F. X. Martin, F.J. Byrne and Cosgrove, A: Oxford, OUP, 1976

Williamson was educated at Westminster School, Trinity College, Cambridge,Alumni Cantabrigienses Magdalen College, OxfordAlumni Oxonienses and Trinity College, Dublin."Alumni Dublinenses : a register of the students, graduates, professors and provosts of Trinity College in the University of Dublin (1593–1860George Dames Burtchaell/Thomas Ulick Sadleir p883: Dublin, Alex Thom and Co, 1935 A noted authorDublin: Renaissance City of Literature” Miller, K/ Gribben, M (Eds) pp193-201 Manchester, Manchester University Press, 2017 A Catalogue of the Lansdowne Manuscripts in the British Museum Part 2, Sir Henry Ellis, Francis Douce, William Petty Marquis of Lansdowne p24: London; British Museum Department of Manuscripts; 1819 he held livings at Wappenham, Ardstraw,Incumbents of Ardstraw Dromiskin and Kilsaran from 1660. He was Treasurer of Christ Church Cathedral, Dublin from 1664 until 1671."Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 2" Cotton, H. p62 Dublin, Hodges & Smith, 1848–1878

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