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
Henry Halford – Wikipedia
Jane Austen Society of North America - New Jersey Region 