"On 29 December, 1170, Thomas Becket was murdered by four knights in this spot, which came to be called The Martyrdom. Above the altar is a sculpture of two swords and a broken sword point, a reminder that one of the knights broke his sword tip when striking a blow to Becket's head. "
--from
http://www.britainexpress.com/photos.htm?attraction=111&page=2
Saint Thomas of Canterbury, pray for us.