Griffin of Edward III – the most famous “beast” of English heraldry, the Griffin of Edward III came to the throne with the longest-reigning Medieval king. Edward III adopted the Griffin, a mythical half lion-half eagle creature, as part of his private seal. During his reign, the Lion of England and Falcon of the Plantagenets supported the Royal Arms, but the Griffin played a part in his private seal with the use of a badge featuring the Round Tower at Windsor Castle where he was born.