One of the administrative changes that Edward I (1239–1307) introduced during his reign as King of England (1272–1307) was to recognize and legalize, in 1303, units of weight such as the ounce, pound, wey, stone, and hundredweight. Later, in 1335, these weight units were grouped together under the name avoirdupois, a French word meaning "goods of weight", intended mainly for use in trade.