Hippocrates was a 5th century BC Greek-born physician known as Earth's "Father of Medicine". He developed an oath of medical ethics that was later known as the Hippocratic Oath and is taken by physicians as they begin their medical practice.
While the crew of the USS Enterprise visited the Platonians in 2268, Philana gave Dr. McCoy a scroll of ancient Greek cures, penned by Hippocrates himself, after McCoy saved Platonius. (TOS: "Plato's Stepchildren")
Following McCoy's release from Dramian custody, Spock chastised McCoy for be derelict in his duties, including the dispensing of the regular vitamin rations to the crew. When McCoy retorted that they both knew what he had just been through, Spock responded, "Hippocrates would not have approved of lame excuses, doctor." (TAS: "Albatross")