King's College London (informally King's or KCL; formerly styled King's College, London) is a public research university located in London, United Kingdom, and a constituent college of the federal University of London. King's was founded in 1829 by King George IV and the Duke of Wellington and received its royal charter in the same year, making it arguably the third-oldest university in England. King's became one of the two founding colleges of the University of London in 1836 and has grown through mergers, including with Queen Elizabeth College and Chelsea College of Science and Technology (in 1985), the Institute of Psychiatry (in 1997), and the United Medical and Dental Schools of Guy's and St Thomas' Hospitals and Florence Nightingale School of Nursing and Midwifery (in 1998). King's has become the largest centre for graduate and post-graduate medical teaching and biomedical research in Europe as per number of students and is regarded as one of the leading multidisciplinary research universities in the world.