The Celtic plough was an incredibly advanced piece of farm machinery. The earliest records of its use were found on the Camonica rock carvings, in Val Camonica, north of Milan. While many societies continued to use ploughs with wooden blades or 'shares', the Celts began to make them from iron. They also introduced the coulter, a sharp knife that made a vertical cut and turned the soil over on itself. This innovation saved farmers a huge amount of time and effort, as a field could now be ploughed in one pass instead of two or more.
