On 26 April 1411 John Jacob married Joanna of Savoy (1395–1460), daughter of
Amadeus VII, Count of Savoy and
Bonne of Berry. Their children were: •
John IV (1413–1464), Marquis of Montferrat 1445–1464. •
Amadea (1418–1440), married to
John II de Poitiers-Lusignan, king of Cyprus. • Isabella (ca. 1419–1475); married to
Ludovico I del Vasto, Marquis of Saluzzo. •
William VIII (1422–1483), Marquis of Montferrat 1464–1483 •
Boniface III (1424–1494), Marquis of Montferrat 1483–1494. •
Theodoro (1425–1481), cardinal. ==References==