Sources:
https://familytrees.genopro.com/Azrael/2582920/Marmion-Robert-I1196...
https://www.wikitree.com/wiki/Marmion-16

Family and descendants
Marmion first married Matilda/Maud, daughter of William de Beauchamp of Elmley,[3] with whom he had the following issue:

Robert the Elder (d.1241), of Tamworth, Scrivelsby and Normandy.

Mabel m. Hugh de Say of Richard's Castle

daughter m. William de Lizures

and secondly, to Philippa, who bore him:

Robert the Younger, of Winteringham, Coningsby and Tanfield.

William, of Torrington and Normandy.

Palmer claimed that he had at least the following three additional sons:

Phllip Geoffrey, (d. 1276)
Manasser (aka Manser or Mauncer)

son of Roger Marmion I of Tamworth and Scrivelsby (d 1130) and father of Robert Marmion III (d 1185) and grandfather of Robert Marmion IV the Justiciar (d 1218).

"Robert Marmion (d. 1143), was a warlike man, who in the days of the anarchy under Stephen had no match for boldness, fierceness, and cunning (Newburgh, i. 47). In 1140 Geoffrey of Anjou captured his castle of Fontenay in Normandy, because he held Falais against him (Robert de Torigny, iv. 139). Three years later he expelled the monks of Coventry, and made a castle of their church. Soon after, on 8 Sept. 1143, he engaged in a fight with the Earl of Chester outside the walls of his strange fortress. Being thrown from his horse between the two armies, he broke his thigh, and as he lay on the ground was despatched bv a cobbler with his knife. He was buried at Polesworth, Warwickshire, in unconsecrated ground as an excommunicated person (Newburgh, i. 47; Ann. Mon. ii. 230). Dugdale says his wife was Matilda de Beauchamp, but her true name seems to have been Melisent. Robert restored the nuns to Polesworth, of which they had been dispossessed, and began the foundation of the monastery of Barberay in Normandy." (Dictionary of National Biography, 1885-1900, Volume 36, "Marmion, Robert" by Charles Lethbridge Kingsford @ http://en.wikisource.org/wiki/Marmion,_Robert_(DNB00)

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ROBERT (ROBERT 1, ROGER 2)
http://freepages.genealogy.rootsweb.com/~mainegenie/MARMION.htm

b.c.1110 Tamworth Castle, Warwickshire

m. MILICENT de RETHEL (b.c.1116 Rethel, Ardennes, m.2. Richard de Camville (b.c.1110 Bosworth, Leicestershire, d.c.1176 Sicily), d. ?1143 Stanton Harcourt, Oxfordshire)

d. 8 Sept. 1143 Coventry, Warwickshire

There is some debate concerning the wives of Robert I and Robert 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. (1)

Charter of Ranulph earl of Chester, c.1146, addressed to his constable and steward and all his barons and men, granting Coventry to Robert Marmion in fee and heredity; to hold the same to him and his heirs of the said earl and his heirs with all the appurtenances 'in burgo et in villa' in wood and in plain, in waters and in mills and in all other things, as freely and quietly and with all the liberties by which it was held whilst part of the earl's demesne, and subject to the same agreements between the said Robert and the earl written out before (prescripte) namely that he would serve the earl against all men and women. Witnesses: Hugh Wac, Richard de Canvilla, Simon son of William, Hugh de Cuill', William Redzai', William son of Ralph, Robert 'Potario'. (2)

Issue-

• I. ROBERT- b.c.1132 Tamworth Castle, Warwickshire, m. ELIZABETH ______, d. Oct. 1181 Tamworth
• II. Geoffrey- b.c.1134

Ref:

(1) TAG- Jan. 1944, pp. 255-6

(2) Shakespeare Centre Library and Archive- DR10/256, original at Loxley Hall

• Ancestral Roots of Certain American Colonists Who Came to America before 1700- Frederick Weis, 7th ed., Genealogical Publishing Co., Baltimore, 1992- 246A-25
• The Ancestry of Thomas Bradbury (1611-1695) and His Wife Mary (Perkins) Bradbury (1615-1700) of Salisbury, Massachusetts- John Brooks Threlfall, J.B. Threlfall, Madison, Wisconsin, 1988- p. 506
• The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct, or Dormant- George Edward Cokayne Ed., St. Catherine Press, London, 1910- Vol. 8, p. 505-8; Vol. 9, p.258
• Conquerors and Conquered in Medieval Wales- Ralph Alan Griffiths, St. Martin's Press, NY, 1994- p. 199
• The Victoria History of the County of Oxford- Herbert Edward Salter, Oxford University Press, London, 1907-19- Vol. 12, p. 274
• Conquerors and Conquered in Medieval Wales- Ralph Alan Griffiths, St. Martin's Press, NY, 1994- p. 199
• A Genealogical History of the Dormant, Abeyant, Forfeited, and Extinct Peerages of the British Empire- Sir John Bernard Burke, Pall Mall, London, 1883- p. 100
• Domesday Descendants: A Prosopography of Persons Occurring in English Documents 1066-1166- K.S.B. Keats-Rohan, The Boydell Press, Rochester, 2002- p. 1032

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http://www.mspong.org/picturesque/tamworth.html:

"He and the Earls of Chester were deadly enemies. The Lords of Chester had a noble seat at Coventry, not very far from Marmion's castle. Robert Marmion entered the priory there, which was, we suppose, under the earl's protection, or on his land; he (Marmion) drove out the monks, fortified the priory, and dug deep ditches in the adjacent fields, which he covered lightly with branches and earth, so that any horseman approaching might be entrapped. But it so happened that be was caught in his own snare, for as he rode out to examine the Earl of Chester's forces, which were approaching to attack him, he forgot the exact situation of the ditches, and fell into one. He broke his thigh by the fall, and as unable to release himself; and thus he remained till a soldier saw him, seized him, and cut off his head.

Four generations of Marmions possessed Tamworth after this unlucky Robert, and then the family became extinct in the person of Philip de Marmion, who died in Edward I.'s reign."

From WIkipedia (http://en.wikipedia.org/wiki/Robert_Marmion):

Robert Marmion II "was a warlike man: in 1140 Geoffrey of Anjou captured his castle of Fontenay, because he held Falais against him. Three years later this Robert expelled the monks of Coventry, and made a castle of their church. Soon after, on 8 September 1143, in a fight with the Earl of Chester he was thrown from his horse and he broke his thigh. As he lay on the ground he was dispatched by a cobbler with his knife. He was buried at Polesworth, Warwickshire, in unconsecrated ground as an excommunicated person."