All 3 Uses of

medieval
in
The Picture of Dorian Gray - 20 chapter version

My dear fellow, mediaeval art is charming, but mediaeval emotions are out of date.†
Chpt 6 *

My dear fellow, mediaeval art is charming, but mediaeval emotions are out of date.†
Chpt 6

One hardly knew at times whether one was reading the spiritual ecstasies of some mediaeval saint or the morbid confessions of a modern sinner.†
Chpt 10

Definitions:

(1) (medieval)
relating to or belonging to the Middle Ages

(the period of European history between the fall of the Roman Empire and the beginning of the Renaissance -- roughly 500–1500 AD)

Often thought of as a time of instability, superstition, plagues, feudal lords, and knighthood.
(2) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Much more rarely, medieval may be used to refer to something as old-fashioned and unenlightened.