It is the most significant historical event in Zadar after the Siege of Zadar in 1202 by forces of the Fourth Crusade.
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He had at Rome a conference with the celebrated mystic, Joachim, Abbot of Flora, (in Calabria, Italy), on the subject of the latter's revelations, and aided Foulques de Neuilly in preaching during the Fourth Crusade.
At the time of the arrival of the Crusaders under William of Champlitte and Geoffrey of Villehardouin and the onset of their conquest of the Peloponnese in 1205, it was held by Doxapatres Boutsaras.
The Crusaders's capture of Constantinople in 1204 during the Fourth Crusade ended all support for higher education, although the government in exile in Nicaea gave some support to individual private teachers.
Some of the bones of these two saints, which were looted from Constantinople by the Fourth Crusade in 1204, were returned to the Church of St George by Pope John Paul II in 2004.
Guilhem attacked the papacy not only for the Albigensian Crusade and the cruel sack of Béziers, but also for the failures of the Fourth and Fifth Crusades, papal imperialism, and the moral failings of the clergy.
After the Fourth Crusade and the Sack of Constantinople, scholars such as William of Moerbeke gained access to the original Greek texts that had been preserved in the Byzantine empire, and translated them directly into Latin.
Another omission is Fulk of Neuilly's influence on the origins of the Fourth Crusade.
He, and the song Kalenda Maya, are referenced disparagingly by the protagonist-narrator in Nicole Galland's novel Crossed: A Tale of the Fourth Crusade.
Queller, Donald E. & Madden, Thomas F. The Fourth Crusade: The Conquest of Constantinople (2nd Edition, 1999) ISBN 0-8122-1713-6
Sir Heinrich von Ulmen, a knight, went on the Fourth Crusade to Constantinople, whence he brought valuable treasures back, among others the famous Limburger Staurothek (“Limburg Reliquary of the True Cross”), which can still be seen in the cathedral in Limburg an der Lahn.