[Footnote 177: We learn about the voyage of Sevill from the Catalan Map of Gabriel Valsecca, executed between 1434 and 1439, which (1) gives a very fair representation of several of the Azores, under the names: Ylla de Oesels (St. Mary), Ylla de Fruydols (St. Michael), Ylla de Inferno (Terceira), Ylla de Guatrilla (St. George), Ylla de Sperto (Pico), and another of which the name has been effaced: (2) Bears the inscription: These islands were found by Diego de Sevill, pilot of the King of Portugal, in 1427. [Some have tried to read the MS. date as 1432 (xxxii for xxvii) but the text is against them]. In the Mediceum, or Laurentian Portolano, of 1351, St. Mary and St. Michael are laid down as Insule de Cabrera; St. George, Fayal, and Pico, as Insule de Ventura sive de Columbis; Terceira (?) as Insula de Brazi[l]. On the Catalan Map of 1375, we have San Zorzo ( = St. George, "Jorge"); I. de la Ventura ( = Fayal); Li Columbi ( = Pico); I. di Corvi Marini ( = Corvo); Li Conigi ( = Flores). On the so-called Andrea Bianco of 1436 (probably a re-edition of a much earlier map), St. Michael appears as Cabrera. Corvo and Flores first appear on the Catalan Atlas of 1375, as far as present knowledge goes.] [Footnote 178: _Periplus_, 116 A.] The Cape Verdes is the only group of Atlantic Islands as to which we may be reasonably sure that the mediæval discovery at least was not made before Prince Henry's lifetime. Here the Infant's claim of priority is probably most in danger from Phœnician and Carthaginian sailors;[179] but even here the challenge is not very serious, unless we insist on considering as proven a number of pretensions which are almost impossible to substantiate. [Footnote 179: It is probable that the "Gorgades" of the Greeks were derived from Phœnician accounts; but it is very doubtful whether these represent the Cape Verdes. Ptolemy, as we have seen, places the southern extremity of his Fortunate Isles much in the true position of Santiago, though extending them north through 5 degrees of latitude.] 2.--THE ATLANTIC ISLANDS IN PRINCE HENRY'S LIFETIME.