Medieval navigators’ charts also influenced Leardo. Towards the close of the thirteenth century sailors in the Mediterranean—particularly Italians and Catalans—began making marine maps (known as portolan charts) that far surpassed all earlier maps in the accurate delineation of coast lines. The majority of these show the Mediterranean and Atlantic coasts of Europe and of north Africa but little of the interior of the continents and nothing of the farther parts of Asia. Some, however, were used as the basis for maps of the world. On the latter the shore lines were derived from the navigators’ charts, and the remaining regions were compiled from other sources. The Leardo map belongs in this category.

Among the existing maps dating from the fourteenth and early fifteenth centuries our Leardo map is very closely related to the group of maps drawn by the famous Catalan cartographers of Majorca in the Balearic Islands. In its general outlines it is so strikingly like a Catalan map of about 1450 now preserved in the Este Library at Modena[18] that we must assume a common cartographic ancestor at no great distance back. There are, however, certain legends on the Este map that Leardo does not give, particularly the long inscriptions and a multitude of place names on the Mediterranean and Atlantic coasts. Leardo’s map, on the other hand, has features not shown on the Este map. These are of two sorts: (1) place names in Asia and Africa, the counterparts of which may be found on other Catalan[19] and Italian[20] maps of the period; and (2) river, mountain, and province names taken directly from Ptolemy. There are also not a few names whose origins or counterparts on other maps I have been unable to trace.

Ptolemy’s Geography had been neglected during the earlier Middle Ages, but the enthusiastic interest in Greek literature which characterized the early Renaissance had led to its translation into Latin shortly before Leardo’s time.[21] A strict interpretation of Ptolemy’s data would have necessitated a complete redrafting of the outlines of the continents, as was done on the Ptolemaic atlases of the mid- and late fifteenth century. Leardo made no such attempt. The extent of his concession to the Ptolemaic geography was to sprinkle a few of Ptolemy’s names over a medieval base and to add the Rivers Indus and Oechardes in eastern Asia.[22]

The Known World According to Leardo

The numbers in parentheses correspond to the reference numbers in the Appendix (pp. [32]-60) and on the key maps at the end of the book.

In the Appendix (pp. [31]-67) I have tried to identify as many as possible of the names and other features shown on the Leardo map with existing places, or at least with corresponding features on other maps of the period. Here I propose to conduct the reader on a rapid sight-seeing tour around the map, pointing out some of the most interesting details only.

Asia

In the extreme north (left-hand side) there is a large structure which looks like an Italian church with its campanile (13). The legend beneath, suggested ultimately by a passage from Marco Polo, runs about thus: “[This is] the sepulcher of the [Grand Khan] and they do this when he comes to be carried for interment: he comes accompanied by many armed men who kill those whom they find on the roads, and they say that the souls of these are blessed because they accompany the soul of the Grand Khan to another life.” Marco Polo adds that at the time of the funeral of Mangou Khan 20,000 persons were thus slain! The actual place of burial of the Mongol Khans was in Cathay, far away from northern Russia where Leardo, following the model of Catalan maps, draws it. European cartographers of the fourteenth and fifteenth centuries seem to have known and cared little about the relative positions of places in Asia; as Italian merchants by this time had established contacts with the Mongols in southern Russia, what was more natural than to place the Mongol overlord’s tomb in the hinterland of the Black Sea? Here there was more available space than in the Far East, and here on Leardo’s map the Grand Khan’s tomb could be made symmetrically to balance Prester John’s palace across the map in Africa ([299]).

South of the sepulcher we see the River Volga ([6], [7]) flowing into the northwestern corner of the Caspian ([250]). A branch from the east ([8]), perhaps the Kama, joins the Volga where the latter bends at a right angle to the south. East of the lower Volga is a “desert of thirty days” ([10]), Polo’s mysterious demon-haunted desert of Lop, where the traveler hears ringing bells and other uncanny sounds (possibly “singing sands”). Like the Grand Khan’s tomb, this desert is also wofully misplaced, since the actual desert of Lop lies in eastern Chinese Turkestan. The responsibility is not Leardo’s, however, for the Lop desert is in the same place on the Catalan Atlas of 1375 and on the Este map.

Farther east, beyond a row of six castles representing towns on the borderlands of China ([35]-40), we come to a gulf of the encircling ocean and to a great system of mountains. The gulf ([11]), which contains three islands, appears in almost the same position and form on the Este map, where there is a legend explaining that on the islands griffons and falcons are found and that the natives are not allowed to kill them without the permission of the Grand Khan of the Tatars. This is also from Marco Polo, who writes that the islands where the gerfalcons are bred lie so far north that the North Star is left behind you in the south! The mountains southeast of the gulf make an enclosure shaped something like a θ ([42]-47). Inside the northern half of this θ a legend tells us that “this is the province of Gog and Magog, where many tribes of the Jews were shut in” ([70]), referring to the medieval tradition that Alexander the Great enclosed Gog and Magog—the terrible hordes of Antichrist—within the Caspian Mountains. On many maps the mountains of Gog and Magog in the Far East are named thus. Leardo, however, places “Mo Gaspio” (Caspiae Montes) ([4]) north of the Caspian Sea somewhat nearer the position at which Ptolemy had placed them. To the mountains of Gog and Magog he assigns names derived from Ptolemy’s northeastern Asia. Running westward from the southern basin formed by these mountains Leardo has added a river ([49]), the Oechardes of Ptolemy. Near the point where this river emerges from the mountain rim we see a red spot labeled “Iron gate” ([72]) and, immediately to the west, two short red marks, “Statues of Alexander” ([73]). The iron gate was built by Alexander in the wall enclosing Gog and Magog, and the statues represent trumpeters set up by Alexander to keep guard over these unclean hordes. On the Catalan maps the trumpeters themselves are shown with their trumpets.