The Northern Crusades or Baltic Crusades were religious wars undertaken by Catholic Christian military orders and kingdoms, primarily against the pagan Baltic, Finnic and West Slavic peoples around the southern and eastern shores of the Baltic Sea, and to a lesser extent also against Orthodox Christian Slavs (East Slavs). The crusades took place mostly in the 12th and 13th centuries and resulted in the mass extermination, subjugation and forced baptism of indigenous peoples. The most notable campaigns were the Livonian and Prussian crusades. Some of these wars were called crusades during the Middle Ages, but others, including most of the Swedish ones, were first dubbed crusades by 19th-century romantic nationalist historians. However, crusades against northern pagans were authorized by Pope Alexander III in the bull Non parum animus noster, in 1171 or 1172 .
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