https://en.wikipedia.org/wiki/Margaret_of_Savoy,_Countess_of_Saint-PolIn December 1458 at Casale, she married her first husband, John IV, Margrave of Montferrat, the son of John Jacob of Montferrat and Joan of Savoy. He was a condottiere for the Republic of Venice during the Wars in Lombardy which were a series of conflicts fought between Venice and Milan, and their various allies.
Margaret brought a dowry of 100,000 scudi, and in return received Trino, Morano, Borgo San Martino, and Mombaruzzo. The marriage was childless, although he fathered several illegitimate children. He died on 19 January 1464, leaving her a widow at the age of twenty-five.
She could marry Edward IV instead of her OTL husband