Reginar IV, Count of Mons
|Count of Mons|
|Died||1013 (aged about 63)|
|Spouse(s)||Hedwig of France|
Reginar V, Count of Mons
Lambert of Mons
|Father||Reginar III, Count of Hainaut|
His father Reginar III was exiled in 958 as a rebel, by Otto I, Holy Roman Emperor. Hainaut was held after then by Godfrey I, Duke of Lower Lorraine, but Reginar IV claimed that Mons in Hainaut had been his father's.
He attacked Mons in 973, after the death of Duke Godfrey, but did not manage to hold it, because Godfrey I, Count of Verdun then held it until he died. He managed to replace Godfrey as Count of Mons in 998.
They had children:
- Reginar V, Count of Mons, married Mathilde of Verdun, daughter of Herman, Count of Brabant.
- Lambert of Mons
- Beatrix, who married Ebles I, Count of Rheims and Roucy and Archbishop of Rheims.
- Ermentrude, died at the age of two or three; buried in the Collegiate Church of Saint Gertrude in Nivelles, Belgium. The burial came to light during an excavation. A lead cross, inscribed with her name and that of her parents, was found in the tomb.