It’s funny how they treated cancer:
Treatment was based on the humour theory of four bodily fluids (black and yellow bile, blood, and phlegm). According to the patient’s humour, treatment consisted of diet, blood-letting, and/or laxatives.
https://en.wikipedia.org/wiki/History_of_cancer#Early_diagnosis
He would have to build roads too, but I don’t see why he couldn’t do that. Actually he could have created all of modern technology from the start, but didn’t.