New trade routes: Exploration could lead to the discovery of new trade routes, which could be used to increase trade and generate more revenue for the monarchy.
Spread of Christianity: Many monarchs were motivated by a desire to spread Christianity and convert non-Christian peoples to the Catholic faith.
Scientific knowledge: Exploration could lead to the acquisition of new scientific knowledge and the discovery of new plants, animals, and minerals, which could be used to improve the lives of the monarch's subjects.
Political prestige: Exploration could bring political prestige to the monarchy, as it demonstrated the monarch's power and authority to undertake ambitious projects.