"Manifestation of Power" is a project sponsored by the State of Lower Saxony investigating late medieval fortifications in the East Frisian peninsula. In a joint exercise this May and June, the project partners NIhK and Ostfriesische Landschaft conduct examinations of ceramic sherds from selected castles. To this end, Dr. Stefan Krabath, Dr. Kirsten Hüser, Thorsten Becker M.A. and doctoral student Verena Schölgens M.A. are joining Dr. Sonja König at the Landschaftsforum in Aurich in order to discuss the finds’ chronological classification as well as implications for supraregional trade.