Henry in his maturity was a tall, red-headed man who preserved the vigour and energy of ancestors accustomed for centuries to the warfare of the Welsh marches. … His massive frame towered above the throng, and those about him felt in it a sense of concealed desperation, of latent force and passion. … Bursts of restless energy and ferocity were combined with extraordinary patience and diligence.

Winston Churchill, A History of the English-Sp…, loc. 780