The article considers unknown pages of the history of the left-bank of Saratov. Particular attention is paid to the collapse of the embassy caravan on the Volga near Saratov on October 1, 1639 and to the further actions of Prince F. F. Volkonsky’s Ambassador. For the first time a detailed chronology of the events that took place in this city in the summer of 1637 and in the autumn of 1639 is presented, the Saratov Chronicle compiled 120 years ago is supplemented over the years.The main sources about the history of Saratov of this period are analyzed in detail.