Sir Henry Halford, 1st Baronet, GCH (2 October 1766 – 1844), born Henry Vaughan, royal and society physician, was physician extraordinary to King George III from 1793 to 1820, then as physician in ordinary to his three successors – George IV, William IV and the young Victoria. He also served other members of the Royal Family until his death.
You can read more about Sir Henry here:
Physician to the Regency by Angelyn Schmid – The Beau Monde
Sir Henry Halford, president of the Royal College of Physicians, with a note on his involvement in the exhumation of King Charles I by John S Morris -National Center for Biotechnology Information
The life of Sir Henry Halford, bart., G.C.H., M.D., F.R.S., president of the Royal college of physicians, physician to George III., George IV., William IV., and to Her Majesty Queen Victoria by William Munk – Archive.org
Henry Halford – Wikipedia