In 1555 his father Geoffroy de Buade, lord of the small estate of Frontenac, had entered the service of Antoine of Navarre, governor of Guyenne.
The two men became close friends, and Antoine would accompany Henri on his amorous adventures.
He assisted in negotiating the marriage of Henri IV to Marie de' Medici in 1600.
[5] Antoine's son Henri de Buade (1596–1622) was a playmate of the future king Louis XIII.
[4] Antoine de Buade was made a Knight of the Order of Saint Esprit in 1619.