A Greek-language map of Hibernia (Ireland) and Albion (Great Britain) derived from Ptolemy's "Geography", probably in the early 14th century at Constantinople (Istanbul), held by the Vatopedi Monastery on Mount Athos prior to its theft and purchase by the British Museum. The map reflects Ptolemy's mistaken placement of Scotland at a right angle to the rest of Britain, apparently derived from his reliance on seafarer's logs.