I know what the phrase "beside myself" means, but where did it come from? Who coined it?

Beside myself. : : What does the expression, "Beside myself with joy", mean. : It means experiencing extreme joy. "Beside" was formerly (15th through 19th centuries) used in phrases to mean "out of a mental state or condition, as 'beside one's patience, one's gravity, one's wits'" (Oxford Engl.