In 1425, Peter travelled to
France and
England and visited the universities of
Paris and
Oxford before arriving in
Flanders in 1426, where he spent the next two years at the
Burgundian court. After the death of the second wife of
Philip the Good of Burgundy in 1425, Peter recommended his sister Isabella to him as a wife. Philip sent a delegation to Portugal in 1428–29 that included
Jan van Eyck, who painted two portraits of the Infanta. Philip and Isabella eventually married on 7 January 1430, and one of their sons became Duke
Charles the Bold of Burgundy. In 1427, Peter wrote a famous letter to his older brother, later King Edward, on "the proper administration of the kingdoms", from Bruges. Later that year, King
Henry VI of England (his first cousin once removed) made him a
Knight of the Garter (as were already his father and older brother Edward). In 1428, Peter visited his marquisate of Treviso and the nearby
Republic of Venice, where he was presented with a copy of the book of
Marco Polo by the doge. He later gave that book, as well as maps of the Venetian trade routes in the Orient, to his younger brother
Prince Henry the Navigator. One of the maps was created by the famous Venetian cartographer
Albertinus de Virga in 1411 and possibly shows North America before it was officially discovered. This map was found in the
Alcobaça Monastery which was the main library of the Portuguese Royal family. From Venice he traveled to
Rome, where he was received by
Pope Martin V, and from there he continued to
Barcelona, where he negotiated the marriage of his brother Edward with
Eleanor of Aragon as well as his own future marriage with
Isabella of Urgell, before finally returning to Portugal. , in
Lisbon, Portugal. In 1433, he completed his famous six-volume work, the
Tratado da Virtuosa Benfeitoria. == Regent ==