A Judensau (German for "Jews' sow") is a folk art image of Jews in obscene contact with a large sow (female pig), which in Judaism is an unclean animal, that appeared during the 13th century in Germany and some other European countries; its popularity lasted for over 600 years. The image appears in the Middle Ages, mostly in carvings on church or cathedral walls, often outside where it could be seen from the street (for example at Wittenberg and Regensburg), but also in other forms.
The city of Wittenberg contains a Judensau from 1305, on the facade of the Stadtkirche, the church where Martin Luther preached. It portrays a rabbi who looks under the sow's tail, and other Jews drinking from its teats. An inscription reads "Rabini Schem HaMphoras," gibberish which presumably bastardizes "shem ha-meforasch" (see Shemhamphorash). The sculpture is one of the last remaining examples in Germany of medieval "Jew baiting." In 1988, on the occasion of the 50th anniversary of the Kristallnacht, debate sprung up about the monument, which resulted in the addition of a sculpture recognizing that during the Holocaust six million Jews were murdered "under the sign of the cross".
In Vom Schem Hamphoras (1543), Luther comments on the Judensau sculpture at Wittenberg, echoing the antisemitism of the image and locating the Talmud in the sow's bowels:
“Here on our church in Wittenberg a sow is sculpted in stone. Young pigs and Jews lie suckling under her. Behind the sow a rabbi is bent over the sow, lifting up her right leg, holding her tail high and looking intensely under her tail and into her Talmud, as though he were reading something acute or extraordinary, which is certainly where they get their Shemhamphoras."