Duccius[?] - inscriptions, notably a tombstone of Lucius Duccius Rufinus at York[2] (http://museums.ncl.ac.uk/archive/arma/contents/iconog/tombston/cent1/uk/york/duccius.htm)
... has existed all throughout human history, and probably pre-dates the emergence of effective medicine.
Quackery is still abundant today, herbal medicine[?], ...