The Chronicon Hanoniense names "Egidius de Cin, Gossuinus de Montibus, Eustacius senior de Ruez, Hoelus de Kauren, Ludovicus et Karolus fratres de Frasne, Theodericus de Linea, Iwanus de Waldripont, Henricus et Willelmus fratres de Braina, Robertus de Aisunvilla, Ysaac castellanus Montensis, Willelmus de Birbais" as "comitis [Balduini] [Baudouin IV Comte de Hainaut], Balduinis et Iolendis comitisse filii, commilitones et consiliarii". Reiffenberg records that “Ide” returned serfs to Saint-Ghislain, in the presence of “ses fils Gossuin et Isaac et d’Isembert leur oncle”, by charter dated 1126. “Isaac” donated serfs to Saint-Ghislain, for the souls of “mon père Gossuin de Mons et...de ma mère Ide”, with the consent of “mes frères Nicolas et Gossuin et ma sœur Ermengarde avec son mari Gautier”, by charter dated 1135, witnessed by “Bauduin comte de Mons, moi Isaac, Gossuin mon frère...”. “Eustachius del Ruez, Hugo de Adengen, Gossuinus de Mons, Theodericus de Ligne...” subscribed the charter dated 1147 under which Baudouin IV Comte de Hainaut settled a dispute between Hautmont abbey and Nicolas d’Avesnes. Baudouin IV Comte de Hainaut settled a dispute between Saint-Ghislain abbey and "dominum Gossewinum de Montibus" by charter dated 1155, witnessed by “...Arnulphi de Gavera, Hauveil de Chevren, Theoderici de Linea, Nicolai de Anton, Nicholai de Blaton, Ludewici de Frana et Karoli fratris eius, Balduini castellani, Radulphi de Turrie et Adam filii eius...”.
The necrology of Brogne records the death "VII Id Nov" of "Gosuinus miles de Monz". 2
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