His travel accounts, as well as those of another trader, Ohthere of Hålogaland, were included in the Old English Orosius.
It is unclear if Wulfstan was English or indeed if he was from Hedeby, in what is now northern Germany near the city of Schleswig but in the 9th century was Danish.
According to this account, Wulfstan undertook a journey by sea from Hedeby to the Prussian trading centre of Truso around the year 880.
Wulfstan said that he went from Haethum to Truso in seven days and nights, and that the ship was running under sail all the way.
Weonodland was on his right, and Langland, Laeland, Falster, and Sconey, on his left, all which land is subject to Denmark.