Sebastian Kolditz is Academic Assistant at the Chair of Medieval History, Historisches Seminar, at Heidelberg University. His research concerns Byzantine History with a specific focus on Late Byzantium, Conciliar History and Byzantine-Western relations as well as Mediterranean and Maritime History of the Middle Ages. His publications include the monograph Johannes VIII. Palaiologos und das Konzil von Ferrara-Florenz (1438-1439) (2013-2014), an article on Cultural Brokers in Relation with the Byzantine Court in the Later 14th and 15th Centuries (2013) and an article, written together with Nikolas Jaspert, on Christlich-muslimische Außenbeziehungen im Mittelmeerraum. Zur räumlichen und religiösen Dimension mittelalterlicher Diplomatie (2014).