Lying in State

My thanks in advance for any information as to the etymology and meaning of the "in state" part of "lying in state".

The Oxford Engl. Dict. has just a little about this:

"'In state': with great pomp and solemnity; with a great train; with splendid or honorific trappings and insignia. 'To lie in state': of a dead body, to be ceremoniously exposed to view before interment."

The OED defines one sense of "state" as "costly and imposing display, such as befits persons of rank and wealth; splendour, magnificence . . . " Apparently "lie in state" is connected with that sense.