In 1496, when Katharina was 18 years old, she was elected to be the abbess, and now the head of the large monastery's household. Being still a
Benedictine abbey, the noble women had a free life. Extensive lands with many subjects and people were entrusted to Katharina von Zimmern, supported by the management of an experienced staff, but the main responsibility laid with Katharina. She had all the rights to act, to buy and sell goods, as well the old prerogative of mercy in the city and the right to elect the mayor, even to grant pardons on death sentences. Katharina von Zimmern reorganized the finances of the abbey, tried to regain the old comprehensive right of coinage of the city, and was very active in construction and art. During her 28-year tenure as abbess, Katharina was rarely called in the council records of the city, because her reign brought no complaints within the city of Zürich. Unlike her predecessors, she led the abbey successfully and with tact and discretion. In 1503 four young noble women entered the convent, so that their number was increased to seven. The abbey also included a school which was rebuilt under Katharina. Although the abbesses in the late Middle Ages largely had lost political influence, Katharina was still nominally the city mistress of Zürich and thus the first representative of the city, i.e. all official guests were first greeted by her. Living in transition times, Katharina von Zimmern allowed
Oswald Myconius, a close friend of Zwingli, to teach Latin to the women at the cathedral school . In January 1519 Ulrich Zwingli began at the
Grossmünster church to put the Gospel into the center of the mass and to translate the Bible into the German language. Zwingli wrote about Katharina von Zimmern: "She belongs to the party of Christ and does not refuse any Support to me." In 1523, the
Reformation events themselves came headlong into the city of Zürich. After disputations in the town hall, the churches were cleared and most of the sculptures of saints were stored in the
Wasserkirche. In the adjacent
Dominican convent, the city council gave permission to close the monasteries. Most of the women left the Fraumünster Abbey, and the four remaining noble women of the convent went back to their families. Katharina remained with her assistant alone in the monastery and, without a monastic community in the midst of a reformed city, it was impossible to continue a monastery life corresponding to the Benedictine rules. On 8 December 1524, on the feast of the
Immaculate Conception, Katharina von Zimmern passed the abbey into the possession of the
city of Zürich. Two documents attest to this serious act: The waiver of 30 November and the transfer deed dated 8 December. The transfer deed, drawn up on parchment, with all assets and rights certified by Katharina von Zimmern, confirmed the transfer of the abbey to the city. Katharina assessed the political circumstances and current events properly, but stressed that they are free and self-determined, a conscience decision. A few days after the waiver, Zürich disbanded all other monasteries and took their goods. This became possible only after the abbess had agreed to the peaceful implementation of the Reformation in the city of Zurich. == Late years ==