Which nation did Prince Henry the Navigator significantly support in developing overseas exploration?

Prince Henry the Navigator played a pivotal role in promoting and advancing the Age of Exploration in the 15th century, particularly through his support of Portugal. He was instrumental in establishing a maritime school in Sagres, where navigation techniques, ship design, and geographical knowledge were advanced. Under his patronage, Portuguese explorers were encouraged to venture along the West African coast, seeking new trade routes and opportunities.

Henry's focus was largely on helping Portugal to become a leading maritime power. This support laid the foundation for subsequent significant voyages, such as those by Vasco da Gama and Bartolomeu Dias, which ultimately led to the discovery of new sea routes to India and around Africa. His efforts were crucial in establishing Portugal's dominance in early overseas exploration, making it a central hub for maritime innovation in the 15th and 16th centuries.