Nailed Horseshoe Was Innovative
The other innovation that came to agriculture at much the same time as the [horse-drawn plow] was the nailed horseshoe, and its origins are equally doubtful. Some dated in the ninth century [C.E.] have been found in Siberia, and there are references from the same period to their appearance in Byzantium. By the eleventh century the horseshoe was in use in Europe. Its effect was to put the horse to work in all weathers and over all terrain, for it protected the animal’s feet against both rough ground and foot rot. The horseshoe also permitted horses to be used more for transport, and because people could now ride their draught animals to the fields at a reasonable speed they could afford to live further away from them. The villages grew, as the peasants sought the benefits of community living.
— Connections, pp. 65