The Medici continue their rise to power. In 1421, Papa Joe became gonfaloniere. Around the same time, Pope Marty finally appointed the┬áMedici as the papal bankers. And Papa Joe retires and hands over control of the bank to his two sons – Cosimo and Lorenzo. Then in 1422, Florence gets involved in a costly war with Milan, which bankrupts the city and gives rise to the castato taxation system – a new way of taxing the rich.