the last plantagenet king of england was described by william shakespeare as a ` poisonous bunch-back 'd toad ' in his play depicting the monarch .
but research on the king 's skeleton discovered under a council car park in leicester revealed that this may have been an exaggeration of a spine deformity known as scoliosis .
now a new academic paper claims that even this condition , which caused one of his shoulders to be slightly higher than the other .