Williams forces follow in a march against Count Conan II of Brittany. Rhiwallon, a Celtic chief and brother of Junquene, the archbishop of Dol, asks William to defend Dol against Count Conan. One of the knights in this scene is carrying a banner known as a gonfannon. The bearer of this flag was called a gonfalonier. The gonfannon was a long flag, pointed, or swallow-tailed, or of several tongues, displayed from a transverse bar slung to a pole or spear. It was used for various purposes but chiefly decoration. The gonfannon was much used for ecclesiastical ceremonies and processions.