 The hospital was founded by Sir Philip Crampton, Sir Henry Marsh and Dr Charles Johnston, on Pitt Street (now Balfe Street) in The Liberties as the Institute for Sick Children in 1821.Following amalgamation with the National Orthopaedic and Children's Hospital in 1884, the combined institution moved to Harcourt Street in 1887.It was absorbed into the Tallaght Hospital as its Children's Services Department in June 1998.