Adam of Bremen mentions Birka many times, and the book is the main source of information on the city. Source: Internet
Assuming Birka and Björkö settlement were the same, Adam's travel instructions were latest from the 10th century when Björkö settlement still existed. Source: Internet
After Björkö came to be identified with ancient Birka, it has been assumed that the original name of Birka was simply Bierkø (sometimes spelt Bjärkö), an earlier form of Björkö. Source: Internet
History Truso was situated in a central location upon the Eastern European trade routes, which led from Birka in the north to the island of Gotland and to Visby in the Baltic Sea and later included the Hanseatic city of Elbląg. Source: Internet
Adam himself never visited Birka. Source: Internet
Approximately 700 people lived at Birka when it was at its largest, and about 3,000 graves have been found. Source: Internet