Joseph Hahn has become famous as the chronicler of the Frankfurt Jewish Community at the time of the Fettmilch Uprising (1612 1616). He left a contemporary account of events in his work "Josef Ometz". Josef, known as Juspa, lived from the end of the 16th century until 1637, and was descended from the respected Hahn family of Frankfurt. He received a thorough education at home, and was able to continue his studies after his marriage to the daughter of the community's spokesman, thanks to his father-in-law's support. Joseph Hahn gathered a circle of young scholars and taught and studied with them throughout his life. He was a spiritual force within the Jewish community. When on one occasion the position of community rabbi fell temporarily vacant, the rabbinical duties were entrusted to him, even though he was not formally appointed to the post. Following the expulsion of the Jews after the Fettmilch Uprising of 1614, his was one of the forty families permitted to resettle as an advance party in Frankfurt as early as August 1615. The remainder of the Frankfurt Jews driven out were not restored to their rights until February 1616. Juspa Hahn was one of the group of scholars who created a special Frankfurt feast day, the Purim Vinz in memory of the tragic events. His work, "Josef Ometz", deals not just with every detail of the Fettmilch Uprising, but also with liturgy, religious life, the problems of raising children, and particularly the education of the young. It became a standard work on local Frankfurt Jewish customs and a source work on the history of the Frankfurt Jews.