When the Spanish and Portuguese explorers of the late fifteenth and early sixteenth centuries broke through the established horizons and compelled their fellows to get acquainted with the unknown, they turned the medieval mind loose in a world of fantasies and marvels. New myths were created and old myths regained credence. Columbus suspected that he had found either Japan or the true terrestrial paradise; the flat Florida peninsula was believed to contain the authentic Fountain of Youth; the Seven Enchanted Cities of ancient legend were thought to lie, attainable at last, somewhere north of Mexico; and such creatures as dragons, griffins, unicorns, sea monsters, giants, and headless men with eyes in their chests were accepted as realities in the fabulous lands beyond the seas. Men who supposed that they had a fairly complete understanding of an orderly cosmos found themselves living in a world where almost anything might be true.