The subjects of this Greek's writing included anatomy, dreams & the theory that diseases are not divine in origin
The theoretical reasons for this were embedded in the Hippocratic 
writings, ... Disease was widely assumed to be the result of divine displeasure,... [DOC] [TLE] Galen facts, information, pictures | Encyclopedia.com articles about ... [PAR] The frequently cited forename Claudius is not documented in the ancient texts 
... has justly remarked that these books are mainly biographies of Galen the writer
.