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The Holy Blood of Wilsnack was authenticated when Bishop Dietrich Man of Havelberg went to consecrate the hosts as a precaution, and the central one overflowed with blood, according to later accounts.
Owing to his pride as stated by the chronicler Thietmar of Merseburg (he allegedly once refused the marriage of one of his kinswoman to a Slav "dog"), in 983 the Slavic Lutici and Hevelli tribes sacked the lands of the eastern bishoprics of Havelberg and Brandenburg and reverted to paganism.