incorporated the Hiberno-Romanesque Arch, while the second de Burgo cathedral became the Diocesan Synod Hall, Library and Registry. The cathedral was consecrated on 9 October 1878, with Robert Gregg, Bishop of Cork, as preacher. The funding for this rebuilding was helped by the combination of Church of Ireland dioceses into the new Diocese of Tuam, Killala and Achonry in 1839. The style is Irish pointed. The building is 46 metres (150 feet) long, and the transepts 23 metres (75 feet) wide. The oak reredos is taken from St. Columb's Cathedral Church, Derry. The chancel chairs were presented by Henry Browne, 5th Marquess of Sligo. The present sanctuary floor was quarried at the Merlin Quarries, Galway. The Bishop's Throne, the Pulpit, the Font and the Chapter Stalls were made of Caen stone and Irish marble. The original organ, which has been rebuilt, was the gift of Archbishop Josiah Hort in 1742. At the south west end of the cathedral is a portion of an ancient Irish Cross. The Synod Hall stalls are reputed to have been in a Piedmontese monastery, and brought to Ireland by Edward Joshua Cooper, M.P., of Markree Castle, Co. Sligo, and were later presented to St. Mary's Cathedral. The present-day cathedral contains a Romanesque 12th-century chancel-arch which has been called "the finest example of Hiberno-Romanesque architecture now extant". It also contains the High Cross of Tuam, a national monument which was moved to its present site in 1992, and a significant part of the 14th-century cathedral. In the south aisle, the ornamented shaft of another high cross dating from the late 12th century survives, while the choir stalls are Italian baroque and date from about 1740. The incorporation of these older structures was contrary to the wishes of Sir Thomas Deane. The High Cross of Tuam was erected in the 12th century by Turlough O'Connor to mark the completion of the first cathedral and the appointment of the first Archbishop of Tuam. The stained glass west window, depicting the Transfiguration of our Lord, dates from 1913 and is very fine. Other smaller windows show figures from the Old Testament, Moses, David, Solomon, Ezra, Malachi, and John the Baptist, and a window depicting Christ the King was installed in memory of Deane, the cathedral's architect. Some major renovations took place between 1985 and 1993, and a new central heating system was added in September 2000. The cathedral is