How did red carpet come to be synonymous with royal treatment?

once upon a time, rolling out the red carpet was reserved for kings and queens. now, any two-bit celebrity up for an award gets to tread on one. how agamemnon would have disapproved. title character in the play written by ancient greek playwright aeschylus, agamemnon is tricked by his wife into walking across a red carpet fit only for the "feet of the gods." that was 485 b.c., way before the Academy Awards, so you see how far back the concept goes......