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Lizard Union () was a secret organization of szlachta from Chełmno Land, established in 1397 for protection against Teutonic Knights. The union was founded by Mikołaj of Ryńsk, Jan of Pułków, Fryderyk from Kitnów,, and Mikołaj from Kitnów. Soon the union expanded its influence to other provinces and became the foundation of the later Prussian Confederation, which requested the annexation of Prussia into Poland in 1454.
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