This would be a picture of
Sir Bors l'Esprit Conquerant,
Baron of Southmarche, Knight-Chaplain of the Round Table, Earl Seneshal of New Avalon, Seneschal of Falconbridge and Lord High Mayor of Axeford. He is also the Duke's designated heir. (We have no photo of him yet, so we've posted this image instead.)

Sir Bors' arms are blazoned: Or, a Tigre-de-lis gules.