How did Cardinal Richelieu’s family rise from minor feudal origins?

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The family of Cardinal Richelieu, known as the du Plessis de Richelieu, rose from insignificant feudal origins to prominence primarily through strategic intermarriage with the legal and administrative classes.1

This upward mobility allowed the family to acquire the seigneury of Richelieu in the region of Poitou. The cardinal’s father, François du Plessis, served as the grand provost (chief magistrate) to Henry III, while his mother, Suzanne de la Porte, was the daughter of a councillor of the Parlement of Paris, the supreme judicial assembly of the time.1