Gesta Hammaburgensis ecclesiae pontificum (Deeds of Bishops of the Hamburg Church) is a historical treatise written between 1075 and 1080 by Adam of Bremen. It covers the period from 788 to the time it was written. The treatise consist of:
The manuscript is one of the most important sources of the early Northern German and Scandinavian history and geography. It covers the relations between Saxons, Wendians and Danes.
The fourth book describes the geography of Scandinavia and the Baltic region as well as Iceland, Greenland and Vinland (North America), being the oldest book mentioning (in chapter 38) a part of the North American continent.
Gesta Hammaburgensis Ecclesiae Pontificum. English translation in History of the Archbishops of Bremen, translated with an introduction and notes by Francis J. Tschan. Columbia University Press. New York (1959).