Although there are no records which associate the brother of Reginar III clearly with any specific geographical area, counties called Avernas and Huste were counties belonging to a count or counts named Rudolf in this period, and it has been proposed that this may have been Rudolf the brother of Reginar.
The main documentary evidence is that in 966, a charter states that Rudolf’s property at Gelmen (between St Truiden and Borgloon) had been confiscated because of his infidelity and was now in the county of Werner in the pagus of Hesbaye.
In a charter made in Capua, 26 July 982, "on the day that we fight the Saracens" Otto II certified that if a certain "Cunradus, son of the late count Rudolf" died, he wanted his possessions in Lotharingia to go to Gorze Abbey, and these included "curtis Velm in pago Haspongowe et in comitate Eremfridi comitis".
Velm, now part of St Truiden, did come under Gorze Abbey, and a Count Irimfrid was recorded as dying in the battle.
[13] Of this Count however, Vanderkindere (p.342) says that given his connection to Velm it is "not without some likelihood" that he is a member of the Regnarid family, where the name Rodolphe was familiar.