Erected 28 November 1862. (See footnote also for succinct list of past and present appointments.) The first bishop, Most Reverend Timothy O'Mahony D.D, an alumnus of the
Irish College in Rome and a director of the missionary movement of Propaganda Fide for Ireland, was forced to resign over politically motivated false allegations of alcoholism and fathering a child, although he was eventually cleared by a church investigation and subsequent events. A sesquicentenary celebration of Bishop O'Mahony's installation at Armidale, by
Archbishop Polding, an English Benedictine, was celebrated on 9.3.2021 and led by
Archbishop Fisher and Bishop Kennedy. A large white 2021 dated memorial stone has since been installed on the south side of the cathedral front doors-complementing that on the north side of the cathedral Pyrmont sandstone front doors that commemorates another significant event being the February 5 1911 blessing and laying of the foundation stone of the current cathedral by
Cardinal Moran. Archbishop Mannix, an alumnus of Maynooth College Ireland, preached at the consecration on December 11, 1919. ==Bishops==