The German Reformation – and later Protestantism in the German-speaking world – left far-reaching and diverse traces in the countries of Central and Southeastern Europe. Personal as well as institutional relationships and the resulting cross-border networks from the Reformation period to the 20th century were the focus of a workshop held in July 2018 at Ludwig Maximilian University in Munich in cooperation with the international research training group “Religious Cultures in 19th and 20th-Century Europe”. The multifaceted Protestantism of Central and Southeastern Europe, which largely existed in a diaspora situation, was the subject of a workshop that examined the dynamics of coexistence in different micro-regions. The lectures focused on regions and topics that have so far gained scant attention in research and aimed to take stock of the existing research and theories and to identify fields of research still to be explored. The contributions were published in the anthology "Confession and Diaspora. Relations and Networks between Germany, Central and Southeastern Europe in Protestantism from the 16th to the 20th Century" in the scientific series "Publications of the IKGS".