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In page Agnese del Maino:

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On 31 March 1425 at Settimo Pavese, at approximately age 14, Agnese gave birth to Filippo's daughter, whom they named Bianca Maria. When the baby was six months old, Agnese and Bianca Maria were sent to the castle of Abbiategrasso, where lavish apartments were provided for mother and child. In 1426, at approximately age 15, Agnese bore the Duke a second daughter, Caterina Maria, but the child died shortly after her birth. Filippo, for reasons of state, married secondly, by proxy on 2 December 1427, and in person on 24 September 1428,[citation needed] Marie of Savoy (January 1411 – 22 February 1479), the daughter of Amadeus VIII of Savoy and Marie of Burgundy. The duke's second marriage was also childless, making Bianca Maria his sole heir to the duchy of Milan.