Board Thread:Lore Discussion/@comment-1600847-20130821212751/@comment-178.2.145.95-20160127201210

Jyggalag most likely didn't apperar in Skyrim because it makes no logical sense for him to do so.

All other Daedra involve themselves with mortals because they want to but he is purely logical and if something has no real purpose then he won't do it.