من تزوج John Jacob, Marquess of Montferrat؟

John Jacob Palaeologus (Italian: Giovanni Giacomo Paleologo) (23 March 1395 – 12 March 1445) was the Margrave of Montferrat from 1418 to 1445.

He was born in Trino, Piedmont, the son of Theodore II of Montferrat, with whom he collaborated in the government of the marquisate from 1404. His mother was Johanna of Bar, daughter of Robert of Bar and Marie of France, Duchess of Bar. In 1412 he married Joanna of Savoy, sister of Duke Amadeus VIII.

After his father's death in 1418, John Jacob received the investiture as Marquis by emperor Sigismund. He distinguished himself for some brilliant military campaign in the Apennines area; he also increased his prestige through the marriage between his sister Sofia and the second last Byzantine Emperor, John VIII Palaiologos.

John Jacob's expansion, however, spurred the reaction of the Dukes of Savoy and of Filippo Maria Visconti of Milan. In 1431 they signed an alliance aiming at the cancellation of the Montferrat state. John Jacob was therefore compelled to ask support to France. In 1432 he was defeated anyway and sued for peace, ceding several territories to Savoy but retaining the seigniory over Montferrat, although with the status of Savoy vassal.

However, when Amadeus VIII asked him the payment of the war expenses, John Jacob rebelled; but, after having besieged in Chivasso, he was forced to cease. His state and his prestige were shattered, and he had again to declare himself vassal of Savoy.

John Jacob died at Casale Monferrato in 1445, being succeeded by his son John IV.

Juana de Saboya (Chambery, 16 de julio de 1392 - Casale, enero de 1460) fue una noble de la Casa de Saboya. Era hija de Amadeo VII de Saboya, duque de Saboya, Maurienne y Aosta, llamado el Conde Rojo, y Bona de Berry, hija de Juan I de Berry.

Tenía dos hermanos mayores: Bona, que se casó con Luis de Saboya, y Amadeo VIII de Saboya, llamado «el Pacífico».

Se casó el 26 de abril de 1411 con Juan Jaime de Montferrato (1395-1445). En 1414 se convirtió en condesa y, a la muerte de su suegro Teodoro II de Montferrato en 1418, se convirtió en margravina de Montferrato.​

Dio a luz a siete niños:​

• Juan IV de Montferrato (Casale, 24 de junio de 1413, Casale 19 de enero de 1464), que se casó con Margarita de Saboya;
• Sebastián Ottone (Casale, 16 de junio de 1419 Casale,15 de abril de 1419);
• Guillermo VIII de Montferrato (Casale, 19 de julio de 1420- Casale, 1483), que se casó con María de Foix y con Isabel María Sforza;
• Bonifacio III de Montferrato (Casale, 13 de junio de 1424, Casale 31 de enero de 1494), que se casó con Orvietana de Campo Fregoso, Elena de Brosse-Penthiévre y María Raska;
• Teodoro (Casale, 14 de agosto de 1425, 21 de enero de 1481), obispo de Casale;
• Isabel (Moncalvo, 7 de septiembre de 1427 - Mantua, 1475), que se casó con Ludovico I de Saluzzo;
• Amadea (3 de agosto de 1429-Nicosia, 13 de septiembre de 1440), que se casó con Juan II de Lusignan rey de Chipre.