This category is for pretty much anything that was set in an earlier time than that in which it was made. Well, I mean... I suppose at least a decade before it was made. Or centuries ago, millennia, eons, whatever. Could include drama or comedy (in fact, I guess I'll separate listings for each type of show in the navframe, though you should know that, of course, comedies may have have dramatic elements, and vice versa).
Some shows set in earlier periods may be included in other categories, like action/adventure, camp, fantasy, Masterpiece/Mystery!, westerns, etc.
See also historical fiction, period films, and period webseries