I heard the saying, "life of Riley" when someone was talking about my cat, and I wondered what the origin of the expression is. The only thing I can think of is that it comes from the name of someone who was pampered and lazy, a king for example.
closed as general reference by Kris, kiamlaluno, Robusto, Daniel, Matt Эллен Apr 28 '12 at 17:09
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Etymological note from the entry on Riley in the online Oxford English Dictionary