His parents were Anne Thiboust and Odet de Saffray, seigneur of Mézy, Vimont and Escoville.

The king recalled Pierre du Bois d'Avaugour as governor and tasked Laval, who had briefly returned to France, with finding a replacement.

"[3] Mézy was reluctant to accept until the king offered to pay his debts in exchange for a three-year term.

"[5] Tasked with forming the first Sovereign Council upon his arrival, Mézy relied on Laval's recommendations and appointed five councillors and an attorney general.

The raids that had plagued the colony for more than a decade had abated due to a smallpox epidemic and conflict with the Susquehannock, Odawa and Abenaki.

Although the Onondaga had ceased their attacks against New France, the Mohawk had continued staging small-scale raids against Montreal in 1662 and 1663.

Laval condemned Mézy's behavior from the puplit, while the governor general distributed notices defending his actions.