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However, the only evidence so far identified that Robert may have been a descendant of Berengar is provided by the Vita Gerardi Abbatis Broniense which records that "comes Berengarius Nammucensi castro prsidebat" commenting that "cuius stirpis posteritas ibidem hactenus perstat".
This convoluted reference suggests that the relationship may have been less direct than father/son: maybe Robert was Berengar's grandson, the son of Berengar's daughter.
The onomastic connection with the later counts of Namur is obvious but the precise family relationship, if any, has not been ascertained. Ludwig IV "das Kind" King of Germany confirmed a donation of property including "in pago ac in comitatu Lummensicuius nunc adest comes Perengarius" to the church of Tongern at the request of "Kepehardus et Reginharius comites" and with the consent of "Albuini eo tempore illius comitis" by charter dated 18 Jan 908Flodoard's Annals record that "Berengarius" captured "Giselbertum" (referring to the duke of Lotharingia) and only freed him after receiving "filiis Ragenarii fratris ipsius Gisleberti" as hostages, after which Giselbert ravaged the lands of "Berengarii, Ragenariique fratris sui et Isaac comitis", she was heiress of "comitatus Lomacensis".
Presumably this is suggested because both her father and her husband are recorded as counts "in pago Lominse", and on the assumption that her husband succeeded her father.
Another indication of Robert's family background is provided by the Gesta Abbatum Gemblacensium which names "Rotbertuscomes Namucensis" as the most powerful of the "cteri fratres et nepotes pii patris nostri [Wicperti]", while recording that he oppressed the abbey of Gembloux, it is known that Comte Robert had a fourth son but no further information relating to him has been found.
He presumably died before 981 as he is not named with his brothers in the charter of that date.
de Namur, son of Godefroi Comte de Namur, succeeded his maternal cousin in 1136 as Comte de Luxembourg, the latter being united with Namur after Henri succeeded his father three years later.
A succession crisis was triggered in Namur and Luxembourg after the unexpected birth in 1186 of a daughter to the septuagenarian Comte Henri, who had previously designated his brother-in-law Baudouin IV Comte de Hainaut as his successor.
Berengar, referred to in early 10th century sources as count in the pagus Lommensis, is first named as Comte de Namur in a charter dated 919.
The matter was adjudicated by Heinrich VI King of Germany in favour of the Comte de Hainaut, and later confirmed by Emperor Friedrich I "Barbarossa" who created him Marquis de Namur.
Under the compromise agreed in 1190, Namur was transferred immediately to Hainaut, to which the counties of La Roche and Durbuy would also revert after Comte Henri died.
However, this assumes that the "pagus" is identical with the county, and that each pagus was ruled by only one count at any one time.
It is, however, clear from the development of the county structure in Germany that the counties were not geographically coincident with the pagi.