Guglielmo II da Verona (died 1273/1275) was a Lombard noble from the triarchy of Negroponte (Euboea), considered by earlier historians as a triarch and a marshal of the principality of Achaea in Frankish Greece.
He was the secondthe first, according to K. Hopf despite his primary source, Marino Sanudo son of Guglielmo I da Verona, ruler of the southern third ("triarchy") of Euboea.Loenertz, p 162
According to earlier historians following K. Hopf, he succeeded to this position upon his father's death in 1263/6. He was also thought to have become Baron of Passavant and marshal in the Principality of Achaea from an hypothetical marriage to Margaret de Neuilly,Bury (1886), pp. 333, 350 because he was improperly called "marshal" in Sanudo's Istoria di Romania.It was in fact his wife who became "marshaless" through her second marriage with John of Saint Omer (Loenertz p 164 and 170) These views have been challenged by Raymond-Joseph Loenertz in the 1960s.
He married Catherine, a niece of William II of Villehardouin,Loenertz p 170 with whom he had no known child.
Guglielmo was killed in the Battle of Demetrias, which took place either in 1273 or in 1275 in the area of modern Volos.Bury (1886), pp. 337–338, 350Geanakoplos (1959), p. 284
References
Sources
Raymond-Joseph Loenertz, Les seigneurs tierciers de Négrepont, Byzantion, vol. 35, 1965, re-edited in Byzantina et Franco-Graeca : series altera