His mother was named as a Countess Bertha, in documents concerning grants she made in favour of
Sint-Truiden Abbey just before she died in 967. Not only was her son and heir a Count Arnulf, but Dhondt and Vanderkindere pointed to a shared connection to the , near
Lille about 45 km west of Valenciennes and in the kingdom of France. The version of the grant recorded in the chronicle of Sint-Truiden itself, showed that she had rights in the area of Sint-Truiden itself, in Melveren and Brustem. He and his wife and son appear in a 994 Ghent St Peter charter granting Carvin in Caribant to the Abbey, and he made another grant in 983 for the soul of his late brother Rodger, of
Corulis in Caribant. It has been pointed out by historian Bas Aarts that the witnesses in the grant of Bertha also match partially with another grant by a Bertha with a son Arnulf, to Nivelles Abbey, of 5 manses with meadow and forest on the upper Dyle river. In that charter two younger brothers of Arnulf are named: Herman and Geveard. His father is not named in medieval records, but it has been proposed on the basis of him being count of Cambrai, and his name, that his father must be the Arnulf who was named as a son of Count Isaac of Cambrai in 941. It has also been proposed by Vanderkindere that there was a count of Valenciennes before him named
Count Amulric who is mentioned in two records from about 953 to 973. In the earliest record from the 950s Amulric was described as a count from Hainaut, and it was mentioned that he had married a daughter of Isaac, Count of Cambrai, but the marriage had been annulled by the bishop due to them being too closely related. Arnulf was a close relative of
Bishop Balderic II of Liège, who was in the family of the
Counts of Loon. This relationship was noted in two later Liège documents, the
Vita (life story) of Balderic himself, and a falsified charter, supposedly made 1015. Vanderkindere believed this must have been a connection through his mother Bertha's side. His wife, who survived him, was named Lietgard or Luitgard. It has been proposed that she had a connection to family of the counts of Namur, both because of her son's name, Adalbert, and because after the death of Arnulf she was involved in transactions which led to the acquisition of Hanret, which is in the direction of Namur, by
Lambert I, Count of Louvain. Arnulf and Lietgard had a son named Adalbert (Albert), who predeceased both of them. The obituaries kept by the Saint-Lambert in Liège commemorate the deaths of both Count Arnulf (23 October) and Count Adalbert (30 March) for their grant of
Visé to them, showing that Arnulf had an important patrimony very close to Liège itself. ==References==