"Nikolaus" Storzenbecher or "Klaus" Störtebeker was reputed to be leader of a group of privateers known as the Victual Brothers. The Victual Brothers were originally hired during a war between Denmark and Sweden to fight the Danish and supply the besieged Swedish capital Stockholm with provisions. After the end of the war, the Victual Brothers continued to capture merchant vessels for their own account and named themselves "Likedeelers". Recent studies manifest that Störtebeker was not called "Klaus" but "Johann".

The Victual Brothers, Vitalien Brothers or Vitalian Brethren were a loosely organized guild of 14th century Germanic privateers. They initially included Mecklenburg nobility, but later became an organisation of commoners, and later evolved into piracy. The guild had a clear historical effect in that era on maritime trade in the North and Baltic Seas. As privateers, they provisioned blockaded locations and otherwise served as a naval contingent on behalf of regional rulers, with clients that included the Queen of Denmark, and rulers of Mecklenburg and East Frisia. As their activities turned to piracy, the aims changed to personal enrichment.