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  La Perouse enters Botany Bay and his chaplain, Abbe Mones, celebrates the first
 Mass within Australian territory
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  The First Irish convicts were transported to Botany Bay.
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  First public mass
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  Father John Terry and Father Phillip Connely arrive in Sydney as Australia’s first ever priest.
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  Father Therry was removed from his role as colony’s official chaplin.
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  Father Daniel Power lands in Sydney to replace Father Therry.
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  Fr Power dies
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  Fr John Mcecroe was appointed the official chaplin of Australia.
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  St Mary's chapel was completed
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  Benedictine priest, John Bede Polding is consecrated (ordained as Bishop) in London and appointed Vicar Apostolic with jurisdiction over what is now the Commonwealth of Australia.
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  Five Sisters of Charity arrive in Sydney with a mission to help the poor and disadvantaged in response to a request from Archbishop Polding for a community of sisters in the colony. English-born philanthropist Caroline Chisholm also arrives in Sydney as does a large contingent of secular Irish clergy including Fr John Brady who is appointed to Windsor with a parish that extends from Penrith to the Hawkesbury and Broken Bay.
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  St Mary’s cathedral renovated. Archdiocese now has 33 parishes, 30 churches and 35 priests.
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  Fr John Quinn becomes the first bishop of Brisbane.
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  The NSW government passes Bill to abolish state aid
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  Fire destroys St Mary's cathedral
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  Mary Mackillop and Father Julian Tenison Woods found the Sisters of St Joseph.
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  Mary Mackillop was excommunicated by the bishop of Adelaide because she was thought to incite her sisters to disobedience and defiance.
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  Mary Mackillop is recommunicated into the church and the sisters permitted to continue the work.
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  Archbishop Polding dies at age 85.
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  Mary Mackillop dies.
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  Archdiocese now has 189 churches. Of Sydney’s 170,000 Catholics more than 25,000 kids are enrolled at archdiocese schools
 Cardinal Moran dies.
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  World War one declared. Catholics become influential in Australia's labour party.
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  James Scullin becomes Australia’s first prime minister.
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  Archbishop Michael Kelly dies.
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  Catholic schools are overwhelmed by demand of attendance and children.
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  Death of Pope John XXIII
 Mass changes from Latin to English.
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  Archdiocese of Sydney now has 366 catholic schools with over 115,704 children attending and Cardinal Gilroy dies.
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  Rome declares that Australia is no longer a mission country.
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  Thousands mourn the death of Cardinal Freeman.
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  Pope John Paul visits Australia for the first time.
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  Archbishop Clancy is created as a cardinal.
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  Pope John Paul makes his second visit to Australia.
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  St Mary’s Cathedral is renovated.
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  The beloved Pope John Paul II died.
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  Pope Benedict XVI makes his first visit to Australia when archdiocese of Sydney hosts world Youth Day