 The forebears of All Saints College are St John's Boys School, a primary school established in 1838, St Mary’s Dominican Convent School, established in 1867, and the Marist Brothers High School, Maitland (later known as St Peter's High School).In September 1990 Bishop Leo Clarke (the Bishop of the Diocese of Maitland Newcastle) announced that the three local single-sex Catholic high schools would become co-educational, and united under the banner of All Saints College.St Joseph's College, in the rural village of Lochinvar, and St Peter's were to be Years 7-10 and St Mary's, Years 11-12.