From Adam of Bremen’s Descriptio Insularum Aquilonis

Moreover he spoke of an island in that ocean discovered by many, which is called Vinland, for the reason that vines grow wild there, which yield the best of wine. Moreover that grain unsown grows there abundantly, is not a fabulous fancy, but, from the accounts of the Danes, we know to be a fact. Beyond this island, it is said, that there is no habitable land in that ocean, but all those regions which are beyond are filled with insupportable ice and boundless gloom, to which Martian thus refers: “One day’s sail beyond Thile the sea is frozen.” This was essayed not long since by that very enterprising Northmen’s prince, Harold, who explored the extent of the northern ocean with his ship, but was scarcely able by retreating to escape in safety from the gulf’s enormous abyss, where before his eyes the vanishing bounds of earth were hidden in gloom.