St. Pantaleon was a physician of Nicomedia. His name signifies in the Greek “many shall obtain mercy”; it was given him by Christ with this promise. During his martyrdom Our Lord appeared to him as he was tortured on the rack and burned with flaming torches. He is the principal patron (after St. Luke) of the medical profession. His blood liquefies on his feast day in the phial in which it is preserved at Ravello near Amalfi.
(Source: The New Roman Missal, Rev. F. X. Lasance)