Sir Piers Legh II (1389 - 16 June 1422), also known as Sir Piers de Legh and Peers Legh, was the second generation of the Leghs of Lyme. He was wounded in the Battle of Agincourt on 25 October 1415. His mastiff stood over him and protected him for many hours through the battle. The dog returned to Legh's home and was the foundation of the Lyme Hall Mastiffs. Five centuries later, this pedigree figured prominently in founding the modern English Mastiff breed. An old stained glass window remains in the drawing room of Lyme Hall portraying Sir Piers and his devoted mastiff.