As the memorial centre of the former duchy of Saxony-Gotha-Altenburg (Herzogtum Sachsen-Gotha-Altenburg), the Gotha Research Library preserves an extensive collection of personal occasional writings of the early modern period. Occasional writings belong to a literary genre that is considered to be one of the most productive sources of information on personalities in the early modern period. The aim of the project is to research a source inventory of 7,455 personal occasional writings of the court from the first appearance of humanism until the end of the 18th century. For this purpose, the sources will be scientifically indexed in a bio-bibliographical database, digitized and presented online. With this project, the Gotha Research Library is participating in the cataloguing of 18th century literature published in the German-speaking world. Overall, the project sees itself as biographical-bibliographical basic research on a cultural-scientific topography of the Central German cultural area.