In 1147 Pope Eugenius III declared a crusade against the pagans of the Eastern Baltic, the first papal call to holy war not explicitly aimed at reclaiming Christian territories from Muslim rule. Instead, Eugenius’ decree gave the Latin Christians of Northern Germany and Scandinavia mandate to aggressively expand their borders into the lands of the Wendish Slavs on the northern frontier of Christendom. It would become a mandate with a long afterlife – once the northern borders of Christendom were opened to the crusading ideal, they remained open for three centuries. In the Slavic lands of North-Eastern Europe, the Scandinavian kingdoms and northern states of the Holy Roman Empire had seen opportunity for political and economic expansion; any intent Rome may have had in establishing the Northern Crusades as a vehicle to win souls to Latin Christianity was subordinated to regional politics.

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