the most important factor in the rise of spain as a major european power was
Spanish Empire With the marriage of the heirs apparent to their respective thrones Ferdinand of Aragon and Isabella of Castile created a personal union that most scholars view as the foundation of the Spanish monarchy. Their dynastic alliance was important for a number of reasons, ruling jointly over a large aggregation of territories although not in a unitary fashion. They successfully pursued expansion in Iberia in the Christian Reconquest of the Muslim Kingdom of Granada, completed in 1492, for which Valencia-born Pope Alexander VI gave them the title of the Catholic Monarchs. Ferdinand of Aragon was particularly concerned with expansion in France and Italy, as well as conquests in North Africa.[25]