1923–1970s

Rostrevor College originated as an extension of Christian Brothers College, Adelaide (CBC Adelaide) which had, by 1922, outgrown its ability to house its boarding students on the Wakefield Street campus. In December 1922, the Christian Brothers purchased the Rostrevor Estate in Magill for a sum equivalent to $20,500. The previous owner of Rostrevor has been a nurseryman and as such, the original grounds incorporated extensive and well-kept gardens and orchards of oranges, lemons and stone fruits, as well as Rostrevor House, a coach house, caretakers' residence, stables, and a large lake providing on-site water supply.^[5]

Rostrevor is a village near Newry, now in Northern Ireland, where Ross Thompson Reid was raised. Reid arrived in South Australia in 1839, at the age of six. He accumulated wealth and built a magnificent mansion which he named Rostrevor Hall.^[6] Although the school is situated along the boundary of the suburb of Woodforde, the adjacent suburb of Rostrevor was named in honour of the original grounds on which the school is sited. Rostrevor Hall, now widely known as Rostrevor House, was constructed in two stages with the southern two-storey side completed in 1878, and the arches and northern side added in 1901.^[5]

The main residence, Rostrevor House, was the original accommodation provided to the boarders, the Christian Brothers, and some of the classes. From the time of taking possession in February 1923, a large new chapel, five classrooms and a chemistry laboratory were built before the college could be opened. By the end of the first term these facilities were ready and so after the May holidays, classes commenced at Rostrevor College on 29 May 1923.^[5] Brother Purton was appointed Headmaster of the new college and he, along with three other Brothers, namely McMahon, O'Sullivan and Dean (the last would be replaced later that year by Br Coghlan), all of the boarders and all students in the Intermediate, Leaving and Leaving Honours classes transferred to Rostrevor. Some day scholars joined the junior grades and, from the beginning, there were classes from the very junior grades to Leaving Honours at Rostrevor. For many years after 1923, students from CBC Adelaide transferred to Rostrevor after Intermediate to study from Leaving and Leaving Honours, thus maintaining a close link between the two colleges; in fact, sports teams were drawn from both until the early 1940s, when Leaving and Leaving Honours classes were re-established at CBC Adelaide.. From then on the two colleges became separate and competing establishments.^{[citation needed]}

By the end of 1923, Rostrevor was well established as a school. Throughout the year more facilities, including the bungalow for more accommodation for the boarders and extra classrooms, had been built and Rostrevor was able to settle down to a period of consolidation.

Dan Clifford (1887–1942), owner of D. Clifford Theatres, a cinema chain, was a generous benefactor of the school. Among other things, he commissioned and donated the first ever Rostrevor flag, as well as donating the school's first movie projector. His son, Dan Jnr, who attended the school from 1944, after his father's death.^[7]

The bungalow, which used to exist alongside what is now the Junior School oval, to which it has lent its name ('The Bungalow'), was demolished in 1960. Further developments included the construction of the Rice Wing in 1961, named in honour of the founder of the Christian Brothers, Edmund Ignatius Rice. The Purton Auditorium was completed in 1970,^{[citation needed]} the Mogg wing in the mid-1970s and the J.V. Bourke swimming pool in the late 1970s.

1980s to now

During 1983, Rostrevor celebrated its Diamond Jubilee. The major project for these celebrations was the substantial renovation to the College Chapel. This saw the restoration of the building itself, beautification of its immediate surroundings, redecoration of the interior, new seating at the front of the chapel and a new pipe organ.

During the Jubilee Year, attempts were made to negotiate the retention of the Boarding School. Unfortunately, these efforts were not successful, and so the last group of boarders left at the end of 1983, thus temporarily ending an era in the history of Rostrevor and of the Catholic Church in South Australia. By the mid-1980s, enrolments increased to over 900 and formal management structures were established, with the appointment of Heads of Department responsible for Curriculum Development and the introduction of new Pastoral Care Arrangements. In 1987 the Rostrevor College Board was established, with Justice Kevin Duggan as first chairman. To ensure a sound financial base for future development, the Rostrevor Foundation was also established, with Creagh O'Connor as the first chairman.

The South Australian Commission for Catholic Schools set up a Task Force to examine the needs of Catholic Boarding Schools in South Australia, and asked Rostrevor to again admit boarders. This was agreed to, thus reversing the decision taken some ten years earlier.

Recent improvements to the school, include the construction in 2006 of the new 'Technology and ICT Discovery Centre', with displays of robotics and pneumatics, design and computing. The former 'Technology Centre' was upgraded at the same time, to now be the 'Skills Centre' includes the new Environmental Education Centre and Vocational Counselling facilities. 29 May 2018 marked the 95th anniversary of the college^[8] since 1923 classes officially commenced at Rostrevor College. Port Adelaide defender Jack Hombsch joined the celebration.^[9] The boys marked a 95 on one of the ovals while a high-tech drone hovered above the spectacular College grounds.^[10]