Knights Hospitaller

The Order of Knights of the Hospital of Saint John of Jerusalem, commonly known as the Knights Hospitaller, was a medieval and early modern Catholic military order. It was founded in the Kingdom of Jerusalem in the 12th century and was headquartered there until 1291, thereafter being based in Kolossi Castle in Cyprus, the island of Rhodes, Malta, and Saint Petersburg.

NOTE BY LIEUTENANT-COLONEL M. J. WHELTON, R.A.M.C., ON "MEDICAL WORK OF THE KNIGHTS HOSPITAI-:LERS OF ST. JOHN OF JERUSALEM."

https://militaryhealth.bmj.com/content/jramc/78/2/92.full.pdf