Why did Catherine de’ Medici meet Spanish representatives at Bayonne in 1565?

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Catherine de’ Medici met with Spanish representatives at Bayonne in June 1565 primarily to strengthen peaceful relations between the French crown and Spain. Additionally, she sought to negotiate a marriage between her son, King Charles IX, and Elizabeth of Austria. This meeting occurred during a marathon itinerary she conducted across France from 1564 to 1566, which was intended to help execute the Edict of Amboise and maintain stability within the kingdom.1