A close family connection between Matfried [II] and Matfried [I] is suggested by the name. This is confirmed by the letter dated 878 from Pope John VIII to "Mactefrido illustri comiti" referring to Engeltrud wife of Boso (who was the daughter of Matfried [I]) as "proxime vestre", although this wording suggests a more remote relationship than father and son. "Hlotharius…imperator augustus" granted property "in pago Lugdunense" to "cuidam vassallo…Immoni", at the request of "Matfredus…comes vel ministerialis noster", by charter dated 15 Dec 843.
Graf von Eifel: "Hlotharius…imperator augustus" granted property "in pago Eiflense…in villa…Bettinga" to "cuidam fideli nostro Fulcrado", at the request of "Matfridus…ministerialis noster", by charter dated 17 Feb 844. "Hlotharius…imperator augustus" granted property "in pago Riboariense in comitatu Iuliacense" to "vassallo…Matfredi…comitis, Hrotgario", at the request of "ministerialis nostri Matfridi…comitis", by charter dated 7 May 846. "Hlotharius…imperator augustus" donated property "in pago Eiflinse in comitatu Matfridi" to Kloster Prüm by charter dated 28 Jan 855. "Hlotharius…rex" donated property "in pago Eiflinse in comitatu Matfridi" at the request of "Adalardus et Matfridus…comites" to "vassallo præfati Matfridi Otberto" by charter dated 28 Jun 856. .An agreement between Charles II "le Chauve" King of the West Franks and his brother Ludwig II "der Deutsche" King of the East Franks dated Jun 860 names "nobilis ac fidelibus laicis…Chuonradus, Evrardus, Adalardus, Arnustus, Warnarius, Liutfridus, Hruodolfus, Erkingarius, Gislebertus, Ratbodus, Arnulfus, Hugo, item Chuonradus, Liutharius, Berengarius, Matfridus, Boso, Sigeri, Hartmannus, Liuthardus, Richuinus, Wigricus, Hunfridus, Bernoldus, Hatto, Adalbertus, Burchardus, Christianus, Leutulfus, Hessi, Herimannus, item Hruodulfus, Sigehardus". 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 travels across the Meuse. Pope John VIII wrote a letter to "Mactefrido illustri comiti" dated 878 referring to the property of the two daughters of Count Boso in upper Italy & his wife Engeltrud "proxime vestre". "Hildebertus filius quondam Berengarii comitis" donated property "res…mee in comitatu Vuabrinse prope fluvio…Cherus villam…Beuram" for "germano meo Berengario" to Verdun Sainte-Vanne by charter dated 18 Sep 882, subscribed by "Stephanus comes, Matfridus comes, Witpertus comes". 1
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