Research Notes:

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 undated passage "Raginerus" fighting "cum Frissonibus in Walacria contra Rollonem", although it is unclear from the context whether these references are to "Raginerus dictus Longi-colli". Guillaume de Jumièges describes how "Rainier au long cou duc de Hasbaigne et du Hainaut et Radbold prince de Frise" fought the Viking Rollo but were forced back to their castles. The Chronicle of Alberic de Trois Fontaines also refers to "Rainerus Hainonensium comes et Hasbanii dux" fighting the Vikings, dated to 876. An agreement dated 14 Jun 877 of Emperor Charles II "le Chauve", presumably written with his own death in mind, names "Arnulfus comes, Gislebertus, Letardus, Matfridus, Widricus, Gotbertus, Adalbertus, Ingelgerus, Rainerus" as those willing to support the emperor's son if he travelled across the Meuse...

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". "Ragenarius comes…et coniuge mea Hersenda" confirmed the donation of revenue from "Sathanacense atque Mousense" to Saint-Dagobert de Stenay made by "Carolus…Augustus Imperiali" by charter dated to after 886. The Annales Vedastini name "Balduinus…comes et Rodulfus frater eius necnon et Ragnerus" when recording that they joined Zwentibold of Lotharingia in 895. The Breve Chronicon Epternacense names “Reinerus” as abbot of Echternach from 897 to 915. Regino records that in 898 Zwentibold King of Lotharingia banished "Reginarium ducem…sibi fidissimum et unicum consiliarium" who went with "Odacro comite et quibusdam aliis, cum mulieribus et parvulis" to "Durfos" (near "Mosa fluvius") where they were besieged. The passage appears to be the only indication that Reginar was granted the title duke. Reginar was presumably rehabilitated after King Zweintibold was murdered, as shown by the following charter. Ludwig IV "das Kind" King of Germany confirmed an exchange of property between Kloster Stablo and "Reginarius comes" by charter dated 10 Sep 902. King Ludwig IV also confirmed an exchange of property involving "Reganarius comes" by charter dated 20 Oct 906, and a donation of property "…in pago ac in comitatu Hainuense" to the church of Tongern at the request of "Kepehardus et Reginharius comites" by charter dated 18 Jan 908. "Raginarius comes" and the abbot of Stavelot granted property "in pago Hasbanio in locis Honavi, Versines et Serangio" to "quidam fidelium nostrorum Harduinus" by charter dated 911, signed by "Ragenarii comitis, Issaac comitis, Macineri comitis…".

Reginar was installed as marchio by Charles III "le Simple" King of the West Franks in 915.

Lay-abbot of St Servatius at Maastricht before May 898, and of Stablo and Malmédy 900-902.

Richer records the death of "Ragenerus vir consularis et nobilis cognomento Collo-Longus" at "apud Marsnam palatium".

"Ragenarius comes…et coniuge mea Hersenda" confirmed the donation of revenue from "Sathanacense atque Mousense" to Saint-Dagobert de Stenay made by "Carolus…Augustus Imperiali" by charter dated to after 886. ¹