Galen was a physician, born in Asia Minor, who had been dead more than 1,000 years before the "Shakespeare" plays were written, and Paracelsus was another physician born in Switzerland, who at that time had been dead nearly a hundred years.
There is no connection between these two
physicians, but for some unknown reason Francis Bacon had a great
contempt for both these men and he ridicules them in his
Redargutio Philosophiarum, where he calls Galen a man of the
narrowest mind, a vain pretender, and states that Galen condemned
mankind to death on the assumption that whole classes of diseases are
incurable. Bacon's opinion of Paracelsus is no better.
Is it a coincidence that "Shakespeare" also ridicules Galen and Paracelsus in "All's Well that Ends Well" (Act 2, Scene3). and holds them up to scorn in association with the court physicians who had pronounced the King's malady incurable?
SirBacon.org - Sir Francis Bacon's New Advancement of Learning