Adam of Bremen's history of the See of Hamburg and of Christian missions in northern Europe from AD 788 to 1072 is a primary source of knowledge concerning the history, geography and ethnography of the Baltic region and its peoples before the 13th century. Arriving in Bremen in 1066 and soon falling under the tutelage of Archbishop Adalbert, who figures prominently in the narrative, Adam was in the vanguard of the campaign to convert Slavic and Scandinavian peoples to Christianity. His history reflects the firsthand accounts he received from travellers, traders and missionaries on the hinterlands of medieval Europe.