What was the "new alliance" made by the king of Navarre?

The "new alliance" made by the king of Navarre, which was a strategic move during the religious conflicts in France, primarily the Wars of Religion, involved a marriage between the Protestant king and a Catholic princess. This alliance was significant as it aimed to bridge the divide between the Protestant Huguenots and Catholic factions, promoting a semblance of unity in a deeply divided France.

The marriage served not just as a personal union but also as a political maneuver to strengthen the position of the king of Navarre and potentially stabilize France through a reconciliation of religious differences. By marrying into the Catholic royal family, the Protestant king sought to gain legitimacy and support, as well as diminish hostilities, highlighting the complexities of religion and politics during this tumultuous period.

Other options present alternative scenarios that do not accurately reflect the historical context. For instance, a treaty with Swiss mercenaries or granting regional powers would not have directly addressed the immediate need for an alliance that would foster stability through familial ties. Additionally, any agreement to end religious toleration would contradict the very motives behind such a marriage alliance, which aimed at reducing sectarian violence and promoting coexistence.