In the 15th and 16th centuries, Portugal established the first global maritime and commercial empire, becoming one of the world's major economic, political and military powers. During this period, today referred to as the Age of Discovery, Portuguese explorers pioneered maritime exploration with the discovery of what would become Brazil (1500). During this time Portugal monopolized the spice trade, divided the world into hemispheres of dominion with Castile, and the empire expanded with military campaigns in Asia. However, events such as the 1755 Lisbon earthquake, the country's occupation during the Napoleonic Wars, and the independence of Brazil (1822) erased to a great extent Portugal's prior opulence. A civil war between liberal constitutionalists and conservative absolutists in Portugal over royal succession lasted from 1828 to 1834.