Jörg Sonntag, Coralie Zermatten (ed.), Loyalty in the Middle Ages. Ideal and Practice of a Cross-Social Value. Essays in Honour of Gert Melville, Turnhout (Brepols) 2015, XXII–467 p., 5 fig. (Brepols Collected Essays in European Culture, 5), ISBN 978-2-503-55103-6, EUR 110,00.