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http://fmg.ac/Projects/MedLands/LOTHARINGIAN%20(LOWER)%20NOBILITY.htm#Giselbertdied877 [REGINAR [I] "Langhals/Longneck" ([850]-Meerssen [25 Aug 915/19 Jan 916]). The primary source which confirms his parentage has not yet been identified, although his naming his son Giselbert suggests that this affiliation is probably correct. The Annales Hanoniæ name "Rignerius Montensis comes" (although the reference to his being Comte de Mons appears to be anachronistic) as the ally of "Francone episcopo Leodiensi" against the Vikings in 870, and in a later undatedpassage "Raginerus" fighting "cum Frissonibus in Walacria contra Rollonem"[1406], although it is unclear from the context whether these references are to "Raginerus dictus Longi-colli". The date when Reginar was installed as Comte de Hainaut is uncertain but was probably during the last quarter of the 9th century, certainly after the date of the 877 agreement for his county would then not have been "across the Meuse".]