Where to start, Greece, Egypt, China.Let's take a look at Hippocrates.
And the tree he was rumored to have taught under on the  Greek island of Kos dating around
450 BC to 370 BC also where he was born. 
Hippocrates was taught by his father Democritus who with his wealthy father's inheratence traveled the world learned fom many different cultures, he was from the Thrace part of Greece, and himself taught by Leucippus, who thought of an atomic theory. Democritus also thought the universe was created from small particles colliding, and that there may be many worlds. Before Hippocrates there also was Asclepian medicine named for the ancient god Asclepius and had priest doctors who used astrology and dreams in their treatment.
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The island of Kos may have had people living there from 3000 BC or earlier. The place in mythology where during the war between the Titans and the Gods, the god Poseiden took a part of Kos and threw it at the titan Polyvotis trapping him under what is the island Nisyros, where Polyvotis groans trying to escape, this is why the volcano there​ is named after him. This was the transition from the Golden age to the Silver age of man.
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Knowledge of Hippocrates comes mostly from Plato, from the Proagoras and the Phaedrus. Which say he was an Asclepiad a member of a group that traced its roots to the God of Healing. Known as a practioner and teacher of medicine, he held that knowledge of the body depends on knowledge of the whole man. There is no evidence that he left any writings, however medical works were being attributed to him from the medical school of Kos. The writings going by the name of the Hippocratic Collection were put together by Alexandrian scholars of the third century. Which say Hippocrates descenden from Hercules and Aesculapius, traveling the Greek world, studying medicine and philosophy. Curing a Macedonian tyrant of love, driving the plague out of Athens by lighting fires in the public squares, refusing to go to Persia to treat the king, dying at old age. In Larissa in Thessaly his tomb could still be seen in the second century. The honey of the bees swarming there were said to be healing to the mouth.
The Oath 

I SWEAR by Apollo the physician, and Aesculapius, and Health, and All-heal, and all the gods and goddesses, that, according to my ability and judgement, I will keep this Oath and this stipulation - to reckon him who taught me this Art equally dear to me as my parents, to share my substance with him, and relieve his necessities if required; to look upon his offspring in the same footing as my own brothers, and to teach them his art, if they shall wish to learn it, without fee or stipulation; and that by precept, lecture, and every other mode of instruction, I will impart a knowledge of the Art to my own sons, and those of my teachers, and to disciples bound by a stipulation and oath according to the law of medicine, but to none others. I will follow that system of regiment which, according to my abilty and judgement, I consider for the benefit of my patients, and abstain form whatever is deleterious and mischievious. I will give no deadly medicine to any one if asked, nor suggest any such counsel; and in like manner I will not give to a woman a pessary to produce abortion. With purity and with holiness I will pass my life and practice my Art. I will not cut persons laboring under the stone, but will leave this to be done by men who are practioners of this work. Into whatever houses I enter, I will go into them for the benefit of the sick, and will abstain from every voluntary act of mischief and corruption; and, further from the seduction of females or males, of freeman and slaves. Whatever, in connection with my professional practice or not, in connection with it, I see or hear, in the life of men, which ought not to be spoken abroad, I will not divulge, as reckoning that all such should be kept secret. While I continue to keep this Oath unviolated, may it be granted to me to enjoy life and the practice of the art, respected by all men, in all times! But should I trespass and voilate this Oath, may the reverse be my lot!