From http://www.geneajourney.com/marmion.html:

Known as Robert the younger, to distinguish him from his elder half-brother of the same name, he was the son of his father's second marriage to Philippe. On 15 May 1218, he made a fine with the King to pay an amount for having the custody of the castle of Tamworth and the lands of which Robert his father had died seised, to hold until Robert, the elder, his brother, should make his peace with the King and recover his father's lands in England, in which event he was to retain the vills of Winteringham and Coningsby in co. Lincoln, Quinton in co. Gloucester, and Berwick in Sussex. The following day, William de Harcourt was ordered to deliver to him the castle of Tamworth, but in 1220 it was restored to Robert, the elder. On 26 Nov 1224, his right to 5 hides of land in Quinton and to the manor of Berwick was acknowledged by his half-brother, Robert the elder, to whom he granted 2 carucates of land in Coningsby. By his marriage to Avice, daughter of Gernegan de Tanfield, he obtained Tanfield and several other manors of the Richmond fee. He died, probably in 1241, but certainly before 23 Oct 1242. His widow was still living in 1284.

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Robert De Marmion

Robert the younger held Winteringham, together with Richard de Rivers, this branch of the family were summoned to the rebel Parliament of Simon de Montford in 1264 as amongst those urging reforms. The estate passed to Robert the younger's son William Marmion who married Lorette, daughter of Rohese de Douvres.

On 15th June 1215, the Magna Carta was signed by Winteringham’s Robert Marmion the Younger, among others. [http://www.winteringham.info/]