Question

the king
which spanish king was a devout catholic?
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Explanation:

Ferdinand II of Aragon (alongside Isabella I of Castile, as part of the Catholic Monarchs) was a highly devout Spanish king, central to the Spanish Inquisition and the consolidation of Catholic power in Spain. Charles V (Holy Roman Emperor and Charles I of Spain) was also another devout Catholic Spanish monarch, but Ferdinand II is a prominent, direct answer tied to defining Catholic authority in Spain.

Answer:

Ferdinand II of Aragon (or Charles I of Spain/Charles V)