Wulfstan of Hedeby

According to this account, in circa 880 Wulfstan undertook a journey by sea from Hedeby to the trading center of Truso. He met many people on his travels, including Danes, and he may have been the first person to use the word "Denmark (or Danemark)" in his description.

In his 1991 Die Prussen. Ein sympathisches Volk zwischen Weichsel und Memel, Karl Baumann asserts that Wulfstan not only visited, but also lived in Truso, as well as in Samland. According to Baumann, Wulfstan learned to know the customs and ways of his hosts, and he fondly remembered the times living amongst the people.