Lothair, Margrave of the Nordmark

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Lothair or Liuthar (died 25 January 1003) was the Margrave of the Northern March from 983 until his death. He was the Count of Walbeck as Lothair III, son and successor of Lothair II and Matilda von Arneburg. He was a paternal uncle of Thietmar of Merseburg.

He did not inherit the county of Walbeck, but rather became count of Derlingau and Nordthüringgau in 982. When his brother Siegfried died, he tried to seize all his mother's possessions. In 983, Dietrich of Haldensleben was deposed from the Northern March for failing to defend the cities of Brandenburg and Havelberg from the Slavs and preventing their relapse into paganism. He was replaced by Lothair.

Lothair died in 1003 and was buried in Cologne. His widow, Godila of Rothenburg, remained unmarried for four years after his death. His eldest son, Werner, succeeded him in the Nordmark and his second son, Lothair IV, eventually also placed a claim on the Nordmark. His third son, Berthold, rebelled in 1017 and submitted in 1018, and his youngest son, Dietrich, became a canon at Magdeburg around 1008.