Other bishops were: John de Zambuja, or Estêvão; and Gil, who in 1406 sold the episcopal rights over Oporto to the Crown for an annual money payment, reduced in the reign of D. Manuel to 120 silver marks; Fernando Guerra, who in 1425 was created Archbishop of Braga; and Vasco. Antão Martins de Chaves, who succeeded Vasco in 1430, was sent by the pope to Constantinople to induce the Greek emperor to attend the Council of Basle. He succeeded, and as a reward was made cardinal. He died in 1447. Succeeding incumbents were: Durando; Gonçalves de Óbidos; Luis Pires (1454–64), a negotiator of the Concordat of 1455 and a reforming prelate; João de Azevedo (1465–1494), a benefactor of the cathedral and chapter, as was his successor Diego de Sousa, afterwards Archbishop of Braga and executor of King Manuel I. The see was then held by two brothers in succession, Diogo da Costa (1505-7) and D. Pedro da Costa (1511–39), who restored the bishop's palace and enriched the capitular revenues from his own purse; Belchior Beliago; and the Carmelite Frei Baltazar Limpo (1538–52), the fiftieth bishop. He held a diocesan synod in 1540.