The rise of the southern German cities began in 1473, when Emperor Friedrich III went to Baden-Baden to take the cure, thereby turning the town into the meeting-place of the medieval jet-set. Soon ailing people and all sorts of others requiring recuperation were arriving in the Black Forest from all over Europe. In 1500, a spa tax was imposed for the first time. Considering such a distinguished clientele it is hardly surprising that in Baden-Baden valuable coins increased in importance. In 1502, Margrave Christoph I (1475-1527) began issuing goldguldens. They were soon nicknamed "Peter's guldens" after the image of St Peter on their obverse. The saint was depicted as an old man with long hair and beard, holding a key and a book. The key, Saint Peter's main attribute, showed him as the keeper of the heavenly gates, admitting the souls asking for admission or sending them away.