Contemporaneous writers describe him as a man of wit, very keen on concentrating the power on himself, but at the same time with a benevolent and kind personality. His youth education as master of a religious order made him an unusually learned king in the Middle Ages. His love for knowledge and culture was passed to his sons: Duarte, the future king, was a poet and a writer, Pedro, the duke of Coimbra, was one of the most learned princes of his time and Prince Henry the Navigator, the duke of Viseu, started a school of navigation and invested heavily in science and development of nautical topics. In 1430, his only surviving daughter, Isabella, married Philip III, Duke of Burgundy and enjoyed an extremely refined court in his lands; she was the mother of Charles the Bold.
(wikipedia)