Polychronicon commonly included a world map on which Wintland was marked in the Atlantic Ocean near Iceland, but again much closer to the Scandinavian mainland than in reality. The name was explained in both texts as referring to the savage inhabitants' ability to tie the wind up in knotted cords, which they sold to sailors who could then undo a knot whenever they needed a good wind. Neither mentioned grapes, and the Malmesbury work specifically states that little grows there but grass and trees, which reflects the saga descriptions of the area round the main Norse expedition base. More geographically correct were Icelandic texts from about the same time, which presented a clear picture of the northern countries as experienced by Norse explorers: north of Iceland a vast, barren plain (which we now know to be the Polar ice-cap) extended from Biarmeland (northern Russia) east of the White Sea, to Greenland, then further west and south were, in succession, Helluland, Markland and Vinland. The Icelanders had no knowledge of how far south Vinland extended, and they speculated that it might reach as far as Africa. The "Historia Norwegiae" (History of Norway), compiled around 15th–16th century, does not refer directly to Vinland and tries to reconcile information from Greenland with mainland European sources; in this text Greenland's territory extends so that it is "almost touching the African islands, where the waters of ocean flood in". Later Norse voyages Icelandic chronicles record another attempt to visit Vinland from Greenland, over a century after the saga voyages. In 1121, Icelandic bishop Eric Gnupsson, who had been based on Greenland since 1112, "went to seek Vinland". Nothing more is reported of him, and three years later another bishop, Arnald, was sent to Greenland. No written records, other than inscribed stones, have survived in Greenland, so the next reference to a voyage also comes from Icelandic chronicles. In 1347, a ship arrived in Iceland, after being blown off course on its way home from Markland to Greenland with a load of timber. The implication is that the Greenlanders had continued to use Markland as a source of timber over several centuries. Controversy over the location of Vinland The definition of Vinland is somewhat elusive. According to a 1969 article by Douglas McManis in the Annals of the Association of American Geographers, This leads him to conclude that "there is not a Vinland, there are many