King John II of Portugal reigned from 1481 to 1495 and is often regarded as one of the most effective monarchs of the Aviz dynasty. He is known for his strong leadership and efforts to strengthen the Portuguese monarchy, as well as for his role in the Age of Discovery, which expanded Portugal's influence overseas. During his reign, John II implemented significant reforms in administration and finance, enhancing the power of the crown. He also supported explorers like Vasco da Gama and Bartolomeu Dias, paving the way for Portugal's maritime empire and establishing trade routes to India and Africa.