The Victual Brothers (German: Vitalienbrüder) were a loosely organized guild of privateers who later turned to piracy. They affected maritime trade during the 14th century in both the North and Baltic Sea.
Guild of the Victual Brothers
During 14th century, Queen Margaret I of Denmark was battling Albert of Mecklenburg for Scandinavian supremacy. Albert had been King of Sweden since 1364 and Duke of Mecklenburg since 1383. The Vitalian Brotherhood were hired in 1392 by the Dukes of Mecklenburg to fight against Denmark, after Queen Margaret had imprisoned Albert and his son Eric of Mecklenburg in order to subdue the Kingdom of Sweden. While Queen Margaret's forces were besieging Stockholm, blockade runner who came to be known was the Victual Brotherhood, engaged in war at sea and shipped provisions to keep the city supplied. The name Victual Brothers is derived from the Latin word "victualia" — meaning provisions — and refers to their first mission, which was to supply the besieged city. 
The Victual Brothers were organised as a brotherhood or guild. Their main naval enemy in 1392 was the powerful Hanseatic town of Lübeck, which supported Denmark in the war. Apart from Lübeck, the Hanseatic League initially supported the Victual Brothers. Most of the Hanseatic towns had no desire for a victory for Denmark, with its strategic location for control of the seaways. For several years from 1392, the Victual Brothers were a strong power in the Baltic Sea. They had safe harbours in the cities of Rostock, Ribnitz, Wismar and Stralsund. They soon turned to open piracy and coastal plunder. In 1393 they sacked the town of Bergen for the first time and in 1394 they conquered Malmö. They occupied parts of Frisia and Schleswig. They also plundered Turku, Vyborg, Styresholm, Korsholm and Faxeholm castle at Söderhamn in Hälsingland.
At the climax of their power, the Victual Brothers occupied Gotland in 1394 and set up their headquarters in Visby. Maritime trade in the Baltic Sea virtually collapsed, and the herring industry suffered from their depredations. Queen Margaret even turned to King Richard II of England and sought to charter English ships to combat the pirates. From 1395 onwards, Queen Margaret gained the upper hand politically. She united Denmark, Sweden and Norway and formed the Kalmar Union. The Hanseatic League was forced to cooperate with her, foreshadowing its eventual decline. King Albert of Sweden conceded Gotland to the allied Teutonic Order as a pledge (similar to a fiefdom). An invasion army under Konrad von Jungingen (1355 - 1407), the Grand Master of the Order, conquered the island in 1398, destroying Visby and driving the Victual Brothers out of Gotland. 
Likedeelers, successors of Victual Brothers
After the Victual Brothers' defeat and expulsion from Gotland in 1398, the Hanseatic League tried repeatedly but unsuccessfully to completely control the Baltic Sea. Many Victual Brothers still remained at sea. When they lost their influence in the Gulf of Bothnia, the Gulf of Finland and Gotland, they operated from the Schlei, the mouth of the river Ems and other locations in Friesland. The successors to the Victual Brothers gave themselves the name Likedeelers ("equal sharers"): they shared with the poor coastal population. They expanded their activities into the North Sea and along the Atlantic coastline, raiding Brabant and France and striking as far south as Spain.
Their most famous leader was Captain Klaus Störtebeker. He allegedly got his name because he could swallow four litres of beer without taking the beaker from his mouth. However, it might simply be a family name from Wismar. The Low German word Störtebeker means "Down the beakerful". In 1401 the Hamburg warship Die Bunte Kuh, leading a small fleet under Commander Simon of Utrecht, caught up with Störtebeker's forces near Heligoland. After three days' running battle, Störtebeker and his crew were finally overpowered, trapped and executed.
This was not the end of piracy and coastal raiding by the Likedeelers. In 1429, some 28 years after the execution of Störtebeker, members of the Victual Brothers attacked and plundered the important trading town of Bergen, eventually burning it to the ground. Until about 1440, maritime trade in both the North and Baltic Seas was seriously in danger of attack by the Likedeelers.
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- Piraten in Norddeutschland (Birgit Bachmann und Stefan R. Müller)
- Helge Salvesen: vitaliebrødrene (Store norske leksikon)
- Halvard Bjørkvik: Margrete Valdemarsdatter, Dronning (Norsk biografisk leksikon)
- Vitalianer (Andra Upplagan, 1921. Nordisk familjebok
- Die Vitalienbrüder (Stoertebeker)
- Konrad von Jungingen (Neue Deutsche Biographie)
- Germany's most famous pirate (Gudrun Stegen: Deutsche Welle)
- Lornsen, Boy 2005) Klaus Störtebeker (Carlsen Verlag GmbH) (2005) ISBN 978-3551354471
- Meier, Dirk; Angus McGeoch (translator) (2006) Seafarers, Merchants and Pirates in the Middle Ages (Boydell Press) ISBN 978-1843832379
- Puhle, Matthias (1992) Die Vitalienbruder: Klaus Stortebeker und die Seerauber der Hansezeit (Campus Verlag) ISBN 978-3593345253
- Püschel, Klaus, Ralf Wiechmann Günter Bräuer (2003) Klaus Störtebeker (Fink Wilhelm GmbH + Co.KG) ISBN 978-3770538379
- Konstam, Angus (2008) Piracy – The Complete History (Osprey Publishing) ISBN 978-1-84603-240-0
- Agreement on reparations for injuries and damages by vitalians (made between King Henry IV of England and the Hanseatic League)
- Vitalienbrüder (in German)