In April 1496, Claudine's husband became duke of Savoy, and she became duchess consort. His reign was short-lived: he died in November 1497, while Claudine was still pregnant with their daughter, Philiberta. Upon Philip's death, she became the usufructuary dowager of several territories throughout
Auvergne-Rhône-Alpes. Of these, her favourite was
Billiat; she retreated to an estate there in 1498, where she largely spent the rest of her life. She also acted as regent of the duchy of Savoy until her husband's successor,
Philibert II, came of age. The
wax seal she used during this period depicted a combined
coat of arms representing the families Savoy, Brosse, and Brittany. She particularly revered the
Shroud of Turin, a
relic believed by some Catholics to be the burial shroud of Jesus, which was in the House of Savoy's possession. She believed it was capable of miracles, such as protecting those who viewed it from illness, and kept it with her at Billiat for a time. At the time of Charles' ascension, nearly two-thirds of Savoy's annual revenues were committed to payments for widows of previous dukes, of which Claudine was one, alongside
Blanche de Montferrat and
Marguerite d’Autriche. The Catholic Church has not maintained its explicit endorsement of the relic's authenticity in the centuries since, though the feast day continues. == Later life and death ==