The Wendish Crusade was a military campaign in 1147, one of the Northern Crusades, led primarily by the Kingdom of Germany within the Holy Roman Empire and directed against the Polabian Slavs. The Wends were made up of the Slavic tribes of Abrotrites, Rani, Liutizians, Wagarians, and Pomeranians who lived east of the River Elbe in present-day northeast Germany and Poland.

The West Slavs are Slavic peoples who speak the West Slavic languages. They separated from the common Slavic group around the 7th century, and established independent polities in Central Europe by the 8th to 9th centuries. The West Slavic languages diversified into their historically attested forms over the 10th to 14th centuries.