/history/AffiliatedPrograms/jhowe/images/images_new_Horse_Collar.gif

New horse collar (new to the tenth-century West; Chinese evidence is centuries earlier).
The drawings here, showing clear images of the use of the new collars for plowing and harrowing, 
are made from the late eleventh century Bayeux tapestry.

Images from Judith A. Weller, "Roman Traction Systems"