On 20 October 1548, at Moulins, he married Jeanne III, Queen regnant of Navarre, daughter of Henry II of Navarre and his wife Margaret of Angoulême. By his marriage, he became King of Navarre, Count of Foix, of Bigorre, of Armagnac, of Périgord, and Viscount of Béarn. It was reported that Jeanne was much in love with him, but his subsequent actions show that he had little loyalty to her. The southern territory of the Kingdom of Navarre had been occupied by the Spanish since 1512, and Antoine tried to re-establish it. He was ready to sacrifice anything to his political interests.