(4) Marino Sanudo the Elder, to his work, _Liber Secretorum fidelium Crucis_, written between 1306 and 1321, added an atlas of ten maps. Among these, I-V form an ordinary portolano, corresponding especially with Vesconte's work,[248] but giving us no special information upon Africa; while No. VI is the famous map of the world often reproduced. Here a thoroughly conventional Africa is laid down, of the "Strabonian" or "Macrobian" type: its length, from east to west, traversed by the Negro Nile from near the Mountains of the Moon to the Atlantic, is equal to fully twice the breadth from north to south. The deep inlet in the West African coast penetrating east to a "Regio VII Montium" immediately south of the Negro Nile, is a prototype of the similar feature in Fra Mauro, and is perhaps only an exaggeration of the Sinus Hesperius of Ptolemy. This map was probably known to Prince Henry, like the book it accompanied, which contained many important particulars of fourteenth-century trade and navigation. The Mappemonde is a compromise between, or combination of, the portolano and the Mediæval theoretical map, and is quite a landmark in the history of cartography. [Footnote 248: Konrad Kretschmer believes Sanudo's maps to have been draughted entirely or principally by Vesconte.] (5) Pietro Vesconte of Genoa has left three or four works executed between 1311 and 1321, and still extant, viz.: (α) Of 1311, which lacks the Western Mediterranean and West Africa, what remains giving us a "normal portolano" of the Levant and Black Sea. (β) Of 1318, depicting the entire Mediterranean, etc., with the Atlantic, North Sea coasts of Europe (in ten plates), and West Africa as far as "Mogador." (γ) Of 1318 (in six maps), which for our purposes need not be discriminated from (β); and lastly (δ) Of 1320, a map of the world, with plans of cities, a special chart of Palestine, etc. The Mappemonde, which principally concerns us here, is extremely like Sanudo's, and is perhaps the work of the same artist--Vesconte himself. Another work, of 1321, by Vesconte, is mentioned in Santarem,[249] but its whereabouts is now unknown. [Footnote 249: _Essai sur l'Histoire de la Cosmographie_, i, 272, ed. of 1849.] Once more a work of 1327, signed "Perrinus Vesconte fecit ... MCCCXXVII in Veneciis" is conjectured to be only another "normal-portolan" by _Pietro_ Vesconte.