Polish historian and cartographer Joachim Lelewel (1786 - 1861) was the first to gather all available mentions of Johannes Scolnus.
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Primarily, a 1536 globe of cartographer Gemma Frisius depicts an area within the Arctic Circle, north of a strait dividing Terra Corterealis and Baccalearum Regio from the westward projection of Greenland.
Polish historian and cartographer Joachim Lelewel (1786–1861) was the first to gather all available mentions of Jan of Kolno known as Johannes Scolnus, and claimed that Scolvus was really Jan z Kolna (English: John of Kolno), a Polish navigator of the Danish fleet.
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Fragmentary evidence suggests the expedition in 1473 was a joint venture between the kings of Portugal and Denmark, and that Corte-Real accompanied the German sailors Didrik Pining and Hans Pothorst, as well as (the possibly mythical) John Scolvus.