What was the significance of Ferdinand and Isabella in Spanish history?

The significance of Ferdinand and Isabella in Spanish history primarily revolves around their role in the initiation of the Spanish Inquisition. This was a crucial institution established in 1478 that aimed to maintain Catholic orthodoxy in their kingdoms, particularly targeting conversos (Jews who had converted to Christianity) and eventually, Muslims. The Inquisition sought to consolidate their power and unify the religious identity of Spain, which was important following the Reconquista, the completion of the Catholic Monarchs' campaign to reclaim Spanish territory from Muslim rule.

Their reign marked the beginning of a transformative period in Spanish history, paving the way for a strong centralized monarchy and influencing religious, social, and political aspects of the society at the time. This move towards religious uniformity helped solidify Ferdinand and Isabella's control over Spain and established a legacy that would impact the country for centuries.