George IV of the United Kingdom
Sir John Macnamara Hayes, 1st Baronet ("circa" 1750 – 1809) was a military physician. Hayes was born in Limerick, Ireland. He was a British Army surgeon in the US from 1775 to 1783. In the 1790s, he served in the army in the French Revolutionary Wars. In 1784, Hayes was appointed physician-extraordinary to the George, Prince of Wales, the future George IV of the United Kingdom. He was also a physician at the Westminster Hospital from 1792 to 1794.