Robert Guiscard is claimed by Pope Nicholas II as a Duke (Illustration of the Nuova Cronica des Giovanni Villani) [Unknown authorUnknown author / Scanned from the german histrory magazine Der Spiegel Geschichte (6/2010): Die Wikinger - Krieger mit Kultur: Das Leben der Nordmänner. Spiegel-Verlag Rudolf Augstein GmbH & Co. KG, Hamburg 2010, p.71 -- Public domain -- http://commons.wikimedia.org/wiki/File:Robert Guiscard claimed as a Duke (Detail of Nicholas II).jpg]