Torun was an important medieval trade centre. The Teutonic Knights built a castle there (1230-31), and the settlement acquired town rights in 1233.
During the 14th century, Torun joined the Hanseatic League.
Name comes from Polish Tarnów (there are many such cities in Poland, tarnina = kind of river plants), which was later Germanized into Thorn, and re-Polonized into Torun. Name Torun itself doesn't have any etymological meaning. (reference: Professor [Jan Miodek]? said so)
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Someone should write a bit about Culmer Land