But when the sport was imported into Europe, the colors, corresponding to European tradition, often grew to become black and white. Black is regularly used as a color of energy, regulation and authority. In many international locations judges and magistrates wear black robes. That custom started in Europe in the thirteenth and 14th centuries. The customized spread to the cities of Italy at about the identical time, between 1300 and 1320. The robes of judges resembled these worn by the clergy, and represented the law and authority of the King, whereas those of the clergy represented the legislation of God and authority of the church.