To the west stretched what was known as the Sea of Darkness, about which even the cool knowledge of the geographers and astronomers could not think steadily. Nothing was known about it, it did not lead anywhere, there were no people there, there was no trade in that direction. The tides of history and of life avoided it; only now and then some terrified mariner, blown far out of his course, came back with tales of sea monsters and enchanted disappearing islands, and shores that receded, and coasts upon which no one could make a landfall. The farthest land known to the west was the Azores; beyond that stretched a vague and impossible ocean of terror and darkness, of which the Arabian writer Xerif al Edrisi, whose countrymen were the sea-kings of the Middle Ages, wrote as follows:
“The ocean encircles the ultimate bounds of the inhabited earth, and all beyond it is unknown. No one has been able to verify anything concerning it, on account of its difficult and perilous navigation, its great obscurity, its profound depth, and frequent tempests; through fear of its mighty fishes and its haughty winds; yet there are many islands in it, some peopled, others uninhabited. There is no mariner who dares to enter into its deep waters; or if any have done so, they have merely kept along its coasts, fearful of departing from them. The waves of this ocean, although they roll as high as mountains, yet maintain themselves without breaking; for if they broke it would be impossible for a ship to plough them.”
It is another illustration of the way in which discovery and imagination had hitherto gone by steps and not by flights, that geographical knowledge reached the islands of the Atlantic (none of which were at a very great distance from the coast of Europe or from each other) at a comparatively early date, and stopped there until in Columbus there was found a man with faith strong enough to make the long flight beyond them to the unknown West. And yet the philosophers, and later the cartographers, true to their instinct for this pedestrian kind of imagination, put mythical lands and islands to the westward of the known islands as though they were really trying to make a way, to sink stepping stones into the deep sea that would lead their thoughts across the unknown space. In the Catalan map of the world, which was the standard example of cosmography in the early days of Columbus, most of these mythical islands are marked. There was the island of Antilia, which was placed in 25 deg. 35’ W., and was said to have been discovered by Don Roderick, the last of the Gothic kings of Spain, who fled there after his defeat by the Moors. There was the island of the Seven Cities, which is sometimes identified with this Antilia, and was the object of a persistent belief or superstition on the part of the inhabitants of the Canary Islands. They saw, or thought they saw, about ninety leagues to the westward, an island with high peaks and deep valleys. The vision was intermittent; it was only seen in very clear weather, on some of those pure, serene days of the tropics when in the clear atmosphere distant objects appear to be close at hand. In cloudy, and often in clear weather also, it was not to be seen at all; but the inhabitants of the Canaries, who always saw it in the same place, were so convinced of its reality that they petitioned the King of Portugal to allow them to go and take possession of it; and several expeditions were in fact despatched, but none ever came up with that fairy land. It was called the island of the Seven Cities from a legend of seven bishops who had fled from Spain at the time of the Moorish conquest, and, landing upon this island, had founded there seven splendid cities. There was the island of St. Brandan, called after the Saint who set out from Ireland in the sixth century in search of an island which always receded before his ships; this island was placed several hundred miles to the west of the Canaries on maps and charts through out the fifteenth and sixteenth centuries. There was the island of Brazil, to the west of Cape St. Vincent; the islands of Royllo, San Giorgio, and Isola di Mam; but they were all islands of dreams, seen by the eyes of many mariners in that imaginative time, but never trodden by any foot of man. To Columbus, however, and the mariners of his day, they were all real places, which a man might reach by special good fortune or heroism, but which, all things considered, it was not quite worth the while of any man to attempt to reach. They have all disappeared from our charts, like the Atlantis of Plato, that was once charted to the westward of the Straits of Gibraltar, and of which the Canaries were believed to be the last peaks unsubmerged.