Family History Research in Italy
| Male King of Thessalonica Guglielmo del Monferrato, 12th Marquis of Monferrato |
| Birth | Abt. 1240 | Trino, Vercelli, Piemonte, Italy  |
| Death | 6 Feb 1292 | Alessándria, Alessandria, Piemonte, Italy |
| Burial | Lucedio Abbey, Vercelli, Piemonte, Italy |
|
| Marriage | ||
| Other Spouse | Beatrice di Castiglia | F5359 | |
| Marriage | ||
| Father | 11th Marquis of Montferrat Bonifacio II del Monferrato, 11th Marquis of Monferrato | F5360 Group Sheet | |
| Mother | Margherita di Savoia | F5360 Group Sheet | |
| Female Isabella de Clare |
| Birth | Abt. 1240 | |
| Death | Bef. 1271 | |
| Burial | ||
| Father | 6th Earl of Hertford Richard de Clare, 6th Earl of Gloucester | F5389 Group Sheet | |
| Mother | Maud de Lacy | F5389 Group Sheet | |
| Male Guigues VI of Viennois |
| Birth | ||
| Death | ||
| Burial | ||
| Spouse | Lady of Saint-Bonnet Beatrice del Monferrato, Lady of Saint-Bonnet | F5384 | |
| Marriage | ||
| Male Guy II of Bauge, Lord of Bauge |
| Birth | ||
| Death | ||
| Burial | ||
| Spouse | Lady of Saint-Bonnet Beatrice del Monferrato, Lady of Saint-Bonnet | F5385 | |
| Marriage | ||
| Female Margherita del Monferrato |
| Birth | ||
| Death | ||
| Burial | ||
| Spouse | Infante Giovanni di Castiglia, Lord of Valencia | F5390 | |
| Marriage | ||
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