The Dynasty of Aviz was a royal house that ruled Portugal from 1385 to 1580. It was established after the victory at the Battle of Aljubarrota, which secured Portuguese independence from Castile. The dynasty is known for its significant contributions to the Age of Discovery, during which Portugal expanded its maritime empire. Key figures of the Aviz dynasty include King John I, the founder, and Prince Henry the Navigator, who played a crucial role in promoting exploration. The dynasty ended with the death of King Sebastian in 1578, leading to a succession crisis and the eventual union with Spain.