Lübeck and Hamburg concluded an agreement in 1241 to support each other in trade and dealing with street robbery. By 1265 Kiel, Wismar, Rostock and Stralsund had joined the alliance. This led to the creation of the “Wendish quarter” of the Hansa. After the collapse of the German merchants‘ association in Visby in Gotland Lübeck took over the leading role at the end of the 13th century.