The ancient customs were divided into three branches. The first, and perhaps the most ancient of all those duties, was that upon wool and leather. It seems to have been chiefly or altogether an exportation duty. When the woollen manufacture came to be established in England, lest the king should lose any part of his customs upon wool by the exportation of woollen cloths, a like duty was imposed upon them. The other two branches were, first, a duty upon wine, which, being imposed at so much a ton, was called a tonnage, and, secondly, a duty upon all other goods, which, being imposed at so much a pound of their supposed value, was called a poundage. In the forty-seventh year of Edward III a duty of sixpence in the pound was imposed upon all goods exported and imported, except wools, wool-fells, leather, and wines, which were subject to particular duties.