Reginar III (c. 920 – 973) was Count of Hainaut from 940 to 958.He was born in Brabant as the son of Reginar II Count of Hainaut. Together with his brother Rodolphe he took part in the rebellion of his uncle Gilbert Duke of Lorraine. When Gilbert was killed in 939 Regnier had to pledge fealty to King Otto the Great.He then allied himself with King Louis IV of France but King Otto sent duke Hermann of Swabia to quell the rebels in 944.
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