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Reginar III (c. 920 - 973) was Count of Hainaut from approximately 940 until his exile in 958.

He was the son of Reginar II, Count of Hainaut.

He took part in the rebellion of his uncle Gilbert, Duke of Lorraine. When Gilbert was killed in 939, Reginar had to pledge fealty to King Otto the Great.

He then allied himself with

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