On 24 May at 6.30 p.m., a ceremony will be held at the Hochschule St. Georgen in Frankfurt to celebrate the 85th birthday of Father Klaus Schatz. In addition to the history of the Jesuits, Father Schatz has especially researched the First Vatican Council. Schatz's collected essays on Vatican I were recently published as the first volume of the new series "Studies on the History of Councils" by the Aschendorff publishing house (commissioned by the Gesellschaft für Konziliengeschichtsforschung).