Galen-Believed for 1500 years because he was backed by the church so nobody thaught to question him.
he wrote books on all his theorys and findings so nobody could steal his ideas.
Thaught all doctors were quacks which showed he was full of himself.
Discovered the brain controlled the body by publicly performing an experiment on a pig.
never did a full human body diessection.
dissected animals and got things wrong like, a dogs womb was like a womens and that woman and men didnt have the same amount of ribs.