John Farrell, a native of Ireland, consecrated May 11, 1856. He introduced Catholic schools, built St. Mary's Cathedral, and helped to establish the academies of the Ladies of Loretto in Hamilton and Guelph. He also encouraged the founding of St. Jerome's College by the Fathers of the Resurrection, and confided the Owen Sound Missions to the Basilian Fathers. The CRC had been formed in 1836 in Paris. Many of its members were Polish emigrees who left their native country in a time of political turmoil.
P. F. Crinnon, also born in Ireland and consecrated April 19, 1873. He built St. Patrick's Church in Hamilton, Ontario, established the House of Providence, Dundas and secured a site for Holy Sepulchre Cemetery.
T. J. Dowling, D.D., first Canadian incumbent, previously Bishop of Peterborough . Since his May 1889 installment, 14 new parishes had been established, 28 priests ordained, and 22 new churches, schools and presbyteries erected. Catholic hospitals at Hamilton and Guelph, and the new House of Providence at Dundas were also established in his time. During Dowling's time, there were 42 priests in the diocese of Canadian by birth. Four were from Ireland, four from the United States, four from France, three from Germany, two from Poland and two from Italy. Candidates for the priesthood studied at St. Jerome's College in Berlin, Ontario and Grand Seminary in Montreal, Quebec. The diocese had nine parishes for German-speaking people and one Indian parish. There were also chapels for Poles and Italians.
As per 2014, it pastorally served 626,723 Catholics on 16,824 km² in 124 parishes and 1 mission with 228 priests, 35 deacons, 269 lay religious and 15 seminarians. The Diocese of Hamilton comprises the counties and regions of Brant, Bruce, Grey, Halton, Waterloo, Wellington, Wentworth, as well as four Townships in the County of Dufferin, all located in Ontario. The Diocese of Hamilton had begun as a Catholic Mission in Upper Canada. There are 6 deaneries which have 126 parishes in their geographical grouping. There are 7 Catholic school boards in the diocese, 1 Catholic university and 3 university Catholic campus ministries. It has 142 secular and 98 religious priests ministering to 620,518 people in 126 parishes.
Catholic schools
The Government of Ontario accords Catholic schools the same rights as public schools. The taxes paid by Catholics go to support Catholic schools only. Teachers, whether religious or lay, must be qualified to teach according to the same regulations as those governing public school teachers.
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Current affairs
The Diocese of Hamilton celebrated its 150th anniversary in 2006, with Anthony Tonnos celebrating Mass at the seat of the diocese. Special signs, marks and posters were commissioned for many of the diocese's churches, schools and buildings.