born 920 in Brabant to the House of Reginar
Son of Reginar II Count of Hainaut and Adelaide of Burgundy (daughter of Richard, Duke of Burgundy and Adelaide of Auxerre)
Count of Hainaut from 940 to 958.
· Reginar IV Count of Mons
· Lambert I Count of Leuven
Reginar, together with his brother Rodolphe, 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. Otto appointed Conrad the Red as duke of Lotharingia, who tried to diminish the power of Reginar. However, when Conrad rose against Otto, Reginar supported him. In an anarchic situation, Reginar appropriated the dowry of Queen Gerberge, Otto’s sister and mother of the French king, and also church property. In 953, Bruno, Archbishop of Cologne, who had also been appointed duke of Lotharingia, restored order and defeated Reginar. As Reginar refused to submit, he was exiled to Bohemia, where he died in 973 (age 53).
|Reginar II Count of Hainaut||Reginar I Duke of Lorraine||Gilbert (Giselbert) Count of Maasgau|
|daughter of Lothair I Holy Roman Emperor (795-855)|
|Hersent of France||unknown|
|Adelaide of Burgundy||Richard Duke of Burgundy||Bivin of Gorze|
|Richildis daughter of Boso the Elder Count of Turin and of Valois|
|Adelaide of Auxerre||unknown|