Question

Why did spanish monarchs oppose the spread of protestantism?

Answer 1

They viewed it as a threat to their authority.

Step-by-step explanation:

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Answer 2

This is because the Spanish monarchy had been in great relations with the Catholic church and had many ties with it. Many Spanish cardinals were popes even. As Protestantism spread it's influence throughout Europe, Spaniards opposed it due to their connection to Catholicism.