After his marriage, Lorenzo was called upon to undertake a foreign mission. He travelled to Milan and there stood sponsor to the child of the reigning Duke, Galeazzo Sforza, in order to cement an alliance. He gave a gold collar, studded with diamonds, to the Duchess of Milan, and answered as became him when she was led to express the hope that he would be godfather to all her children! It was Lorenzo's duty to act as host when the Duke of Milan came to visit Florence. He was not dismayed by the long train of attendants which followed the Duke, for he knew that these richly-dressed warriors might be bribed to {36} fight for his State if he conciliated their master. There were citizens in Florence, however, who shrank from the barbaric ostentation of their ally. They looked upon a fire which broke out in a church as a divine denunciation of the mystery play performed in honour of their guests, and were openly relieved to shut their gates upon the Duke of Milan and his proud forces. Lorenzo betrayed no weakness when the town of Volterra revolted against Florence, which exercised the rights of a protector. He punished the inhabitants very cruelly, banishing all the leaders of the revolt and taking away the Volterran privilege of self-government. His enemies hinted that he behaved despotically in order to secure certain mineral rights in this territory, and held him responsible for the sack of Volterra, though he asserted that he had gone to offer help to such of the inhabitants as had lost everything. But the war of the Pazzi conspiracy was the true test of the strength of Medicean government. It succeeded a time of high prosperity in Florence, when her ruler was honoured by the recognition of many foreign powers, and felt his position so secure that he might safely devote much leisure to the congenial study of poetry and philosophy.