He is the black bear of Arden.

Guy Beauchamp, Earl of Warwick, was so called, both from his crest, which was a black bear, and from having himself a black and grim countenance, as well as on account of his being a man of undaunted courage. Arden was a forest anciently occupying all the woodland part of this county. This saying was used to express that the person spoken of, and so denominated, was really an object of terror.