Hättebröder ("Cap's brothers"), was a group of a party of German-speaking burghers during the reign of the German Albert, King of Sweden, who came to be known for their oppression and persecution of native Swedish-speaking burghers in the Swedish city of Stockholm.
On 11 June 1389, the Hättebröder finally imprisoned the Swedish mayor Bertil Brun, the official Peter Åländing and another Swede.
On 17 June, the rest of the prisoners were taken to Käpplingeholmen (Blasieholmen), where they were placed in a wooden building and burned.
The result was, in the short term, that the rule of the German party of Stockholm was secured.
They were, however, eventually forced to admit that their act had been illegal, and as a token of reconciliation with the church, had three memorial sculptural stones placed in Södermalm.