The history of King's College London, on its own, spans over 190 years since it was founded by Royal Charter. King George IV granted such charter on 14 August 1829. The full history, however, includes the medical schools that now constitute GKT School of Medical Education. This incorporates St Thomas's Hospital Medical School, one of the oldest medical schools in Britain, with a history of medical teaching that can be traced back to at least 1561. St Thomas' Hospital itself dates back to 1173, and has roots in the establishment of St Mary Overie Priory in 1106.