Commentary
Cawley: "A highly speculative theory is noted under ANTIOCH, which is a possible co-identity between Marchese Guglielmo [III] and Marchese Guglielmo/Odo, the father of Tancred Prince of Antioch, nephew on his mother's side of Bohemond of Apulia Prince of Antioch. If this is correct, the first wife of Marchese Guglielmo [III] was Emma, daughter of Robert "Guiscard" Duke of Apulia. Tancred's father enjoyed a sufficiently prominent position in southern Italy to be described only as "the Marquis" in many contemporary records. No suitable southern Italian family of which he may have been a member has been identified. It does appear that the title "marchese" in Italy was at that time limited to families in the north, a logical conclusion considering the original purpose of the "march" being a border area into which a powerful government (in the case of northern Italy, Germany) was pushing its jurisdiction. Tancred's own illustrious marriage to the daughter of Philippe I King of France in 1106 is also best explained if the bridegroom had good family connections on his father's, as well as his mother's, side of the family. The validity of the theory depends, however, on whether any connection can be proved between Marchese Guglielmo [III] and southern Italy. If further information shows that Marchese Guglielmo's activities were confined to the north, it is improbable that the theory would be correct."
Family
ClaimDetailEvidence
FatherOttone Lord of the March of Monferrato (e1013-) [S1011]
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SpouseOtta di Agledo (e1050-) 
Child +Ranieri di Monferrato Marchese di Monferrato (e1074-~1137) [S1011]
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Attributes
ClaimDetailEvidence
GenderMale
NameGuglielmo III, Marchese di Ravenna [S1011]
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FatherOttone Lord of the March of Monferrato (e1013-) [S1011]
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Timeline
ClaimDateDetailAgeEvidence
Birthest 1049 (1030-1053)
 
Deathbef Dec 28, 1101 [S1011]
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Sources
IndexTitle
[S1011] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Monferrato, Saluzzo, Savona)" (v1.1 Updated 06 April 2007).