This area of the tree took a lot of unscrambling due to drastically garbled information.

None of the following is any better than nth-hand secondary documentation - if that.

http://freepages.genealogy.rootsweb.ancestry.com/~mainegenie/MARMIO...

There is some debate concerning the wives of Robert [Marmion] I and Robert [Marmion] II as being daughters of Gervase de Rethel. Moriarty in the TAG article of Jan. 1944 states that Alberic, Canon of Huyon-sur-Meuse stated that Clarembald de Rosoy, who married Elizabeth de Namur after the death of Gervase in 1124 in order to disinherit her, married the only daughter of Gervase out of the country to a certain noble of Normandy named Robert Marmion. Alberic doesn't give her name or say which Robert Marmion was her husband, however, the daughter of Gervase was married c.1133 so it would make more sense that she was married to Robert Sr. and not Jr. Also, Gervase's mother's name was Milicent thus making Robert Sr.'s wife named after her grandmother. Also, Queen Adeliza of Louvain, wife of King Henry I gave part of Stanton, Oxfordshire, to Milicent, wife of Robert Marmion "cognata mea." Queen Adeliza was a second cousin of Gervase's daughter, both being descended from Albert III de Namur and Ida of Saxony.

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From Stirnet.com:

Gervais, Count of Rethel (b 1075, d 1124)

m. Elizabeth de Namur (dau of Godfrey, Count of Namur, she m2. Clarembaud de Rosoy)

GenEU shows Gervais & Elizabeth as having 2 daughters, Elizabeth (married to either Robert de Marmion or Roger/Clerembaud de Rosoy) and Milicent (possibly married to Robert de Marmion). Various other sites show those daughters with Elizabeth married to Roger de Rosoy and Milicent married to Richard de Camville, whilst some sites show the Milicent who married Richard de Camville as 'de Brabant'. TCP (Marmion) shows Robert de Marmion (the elder) married to Milicent (parentage unknown, she later married Richard de Camville) and having a son, another Robert de Marmion who married Elizabeth, dau of Gervase, son of Hugh, Count of Rethel.

(A) Elizabeth de Rethel

m. Robert de Marmion (d c10.1181)

(B) Milicent de Rethel

http://fmg.ac/Projects/MedLands/champorret.htm#GervaisRetheldiedbef...

Comte Gervais & his wife had one child:

a) MELISENDE de Rethel ([1121/23]-after 1154). The Chronicle of Alberic de Trois-Fontaines records that [her stepfather] "Clarenbaldus de Roseto" alienated the lands of “filiastram suam Gervasii filiam” and married her to "cuidam nobili Roberto Marmioni de Normannia", without giving her name[353]. The Complete Peerage names her “Elizabeth” and identifies her husband as Robert Marmion [IV] without citing any primary source on which it bases this statement[354]. From a chronological point of view, it is more likely that the husband of Gervais de Rethel’s daughter was Robert Marmion [III], considering especially that Robert [III]’s wife had three known children by her second husband whom she married after Robert died in [1143/44]. If that is correct, other sources confirm that Robert [III]’s wife was named Mélisende, not Elisabeth, presumably after her paternal grandmother. A charter dated to [1200], recounting the history of a donation of land to Eynsham abbey, records that King [Henry I] granted “Stantonam [cum] quadam femina” to “Roberto Marmiun”, and that “post Robertum Marmiun” the king granted “predictam Milisent” to “Ricardo de Kamuilla”[355]. Domesday Descendants refers to the second marriage of Mélisende, whom it calls “a kinswoman of Queen Adelicia”[356]. The Victoria County History of Oxfordshire states that the queen “before 1141...gave to her kinswoman Millicent, wife of Robert Marmion, land in Stanton Harcourt and South Leigh...”, without citing the corresponding primary source[357]. White Kennett quotes the charter under which “A...regina” granted “manerium meum de Stanton” in four parts to Reading convent, to the Knights Templars, to “Milisendi cognatæ meæ uxori Roberti Marmium”, and to “Willielmo de Harestactu”, undated[358]. In light of the previous information, her second marriage is indicated by the charter dated 1154 under which Henry Duke of Normandy [the future King Henry II] confirmed Stanton Harcourt, Oxfordshire to "Milicenti uxori Ricardi de Camvilla in feodo et hereditate sibi…sicut regina Adelisia…in maritagium dedit" by charter dated 1154[359]. “Ricardus de Camvilla” donated “terciam partem decimarum...apud Hottoth” to Jumièges, for the souls of “uxoris mee Adelicie et sequentis uxoris mee Milesente...Rogeri fratris mei”, by charter dated [5 Apr 1170/27 Mar 1171], subscribed by “Ricardi filii mei...”[360]. "Philippus de Marmiun filius et hæres Roberti le Marmiun" recalls the donation of “Buteyate” to Bardney made by “Robertus Marmiun…et Milesent uxor mea et Robertus filius meus” by charter dated Jun 1248[361].

m firstly ROBERT Marmion [III], son of ROGER Marmion & his wife --- (-killed in battle [1143/44]).

m secondly (after [1143/44]%29 as his second wife, RICHARD [I] de Camville, son of --- de Camville & his wife [--- de Vere] (-Apulia 1176).