Historiography
Up until the discovery of the original document in 1835 in a register in the Archives of the Cracow Cathedral Chapter, the Union of Krewo was unknown. Usually important state documents were archived at the Crown Archive. It was neither referenced in any contemporary documents nor cited by medieval historians, no chronicles or other written sources mentioned the August 1385 meeting in Kreva. This led the Lithuanian American lawyer Jonas Dainauskas to question act's authenticity in 1975. However, his claims gained little scholarly support.
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