The Aviz Dynasty was a significant royal house in Portugal that ruled from 1385 to 1580. It emerged after the Battle of Aljubarrota, which secured Portugal's independence from Castile. The dynasty is known for its exploration and expansion during the Age of Discovery, leading to the establishment of a vast overseas empire. Key figures of the Aviz Dynasty include King John I, the founder, and King Manuel I, who oversaw a period of great wealth and cultural flourishing. The dynasty ended with the death of King Sebastian, leading to a succession crisis and the eventual union with Spain under the Habsburgs.