[Footnote 7: In 1431 he is said to have purchased house-room for the University of Lisbon; on March 25th, 1448, to have established there a professorship of theology; and on September 22, 1460, to have confirmed this by a charter dated from his Town at Sagres. The Professor was to have twelve marks in silver every Christmas from the tithes of the Island of Madeira (see Azurara, _Guinea_, c. v). As to the Chair of Mathematics, we only know that it existed in 1435; that the Infant was interested in this study; and that tradition connected him with a somewhat similar foundation at Sagres. The houses purchased in Lisbon for the University were bought of João Annes, the King's Armourer, for 400 crowns. Hence, according to some, came the Prince's title of "Protector of Portuguese Studies."] In 1418-20, however, his captains, João Gonçalvez Zarco and Tristam Vaz Teixeira, certainly re-discovered Porto Santo and Madeira.[8] In 1427, King John and Prince Henry seem to have sent the royal pilot, Diego de Sevill, to make new discoveries in the Azores; and, in 1431-2, Gonçalo Velho Cabral made further explorations among the same; but the completer opening up and settlement of the Archipelago was the work of later years, especially of 1439-66. We shall return to this matter in a special discussion of Prince Henry's work among the Atlantic islands. To the same we must refer the traditional purchase of the Canaries in 1424-5 and the settlement of Madeira in the same year,[9] confirmed by charters of 1430 and 1433. King John, on his death-bed, is said to have exhorted Henry to persevere in his schemes, which he was at this very time pursuing by means of a fresh expedition to round Cape Bojador, under Gil Eannes (1433). Azurara from this point becomes our chief authority down to the year 1448, and this and the subsequent voyages are fully described in his pages. Gil Eannes, unsuccessful in 1433,[10] under the stimulus of the Infant's reproaches and appeals passed Cape Bojador in 1434;[11] and next summer (1435) the Portuguese reached the Angra dos Ruyvos (Gurnet Bay), 150 miles beyond Bojador, and the Rio do Ouro, 240 miles to the south. Early in 1436 the "Port of Gallee," a little North of C. Branco (Blanco), was discovered by Baldaya, but as yet no natives were found; no captives, gold dust, or other products brought home. Exploration along the African mainland languished from this year till 1441;[12] but in 1437 the Prince took part in the fatal attack on Tangier, and in 1438 the death of King Edward caused a dispute over the question of the Regency during the minority of his young son Affonso. Throughout these internal troubles Henry played an important part, successfully supporting the claims of his brother Pedro against the Queen-mother, Leonor of Aragon. All this caused a break of three or four years in the progress of his discoveries; but the colonisation of