Aspects of this topic are discussed in the following places at Britannica.
...for power in Europe among the Habsburg dynasties, France, England, and the Netherlands—was likely to lead to a general war. A series of incidents moved events toward the brink. In 1582 the archbishop-elector of Cologne, having converted to Calvinism, challenged the Ecclesiastical Reservation of the 1555 Augsburg treaty by holding on to his title, thus threatening to give the majority...
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