William de Mortimer [b] b abt 1130, of Attleborough, Norfolk, England, d bef 1180. The identity of his wife is not known.
Child of William de Mortimer was:

Robert de Mortimer [c] b abt 1154, of Attleborough, Norfolk, England, d 1216-1217. He md (poss.) Alice de Munchensy abt 1172, daughter of Warin de Munchensy and Agnes FitzJohn.
Child of Robert de Mortimer and Alice de Munchensy was:

Sir Robert de Mortimer [e] b abt 1216, of Attleborough, Norfolk, England, d bef 1265. He md Isabel abt 1235. She was b abt 1220.
Child of Robert de Mortimer and Isabel was:

Constantine de Mortimer [g] b abt 1279, of Attleborough, Norfolk, England, d bef 9 Aug 1359. He md [1] Sibyl abt 1294, and [2] Catherine bef 1342. Sibyl was b abt 1282, d 9 Nov 1334.
Child of Constantine de Mortimer and Sibyl was:

Eleanor de Mortimer b abt 1316, of Attleborough, Norfolk, England. She md Adam de Clifton abt 1329, son of Adam de Clifton.

NOTES:
An intriguing introduction to the Mortimers of Attleborough is offered in The Compete Peerage: "The Mortimers of Norfolk held under the Earls Warenne a fief of which Attleborough was the caput, and Scoulton, Raveningham, Stanford and Rockland among its members. No blood relationship has been proved between them and the Mortimers of Wigmore, but the history of the latter family was also associated with that of the great house of Warenne; for when the castle and seignory of Mortemer-sur-Eaulne was forfeited in 1054 by Roger de Mortemer (ancestor of the Mortimers of Wigmore) they were granted to William de Warenne." Additionally, there is some belief, although proof has yet to be found, that the Mortimers of Attleborough are related to the Mortimers of Richard's Castle, of Herefordshire and Essex.


a. He witnessed a charter of William de Warenne to Castleacre Priory, around the time of Henry I.

b. Fought with the Scots at Alnwick 13 Jul 1174, where he was taken prisoner by Bernard de Baliol. As William de Mortimer, "constable", he witnessed a Norfolk charter of Richard de Baliol ca 1155, and also two charters of William the Lion of Scotland, one of which was granted in 1166.

c. He succeeded his father before 1180, when he and the Earl of Arundel were in joint defence of a plea in Norfolk. He witnessed several charters of Hamelin, Earl Warenne in 1192. He was among those Barons who opposed King John and his lands were escheated before the end of Feb 1216, but said lands were restored to him by 12 Apr following. He died sometime between this date and 21 Sep 1217. He married, possibly, Alice, daughter of Warin de Munchensy and Agnes, daughter of Payn FitzJohn, who was still living in 1192.

d. During his father's lifetime he was granted Scoulton by Richard I. He was evidently at odds with King John, as on 24 Jun 1215, nine days after ratification of the Magna Carta, the sheriff of Hunts was ordered to restore to him, among others, the lands of the which the King had disseised him. He remained in opposition to the King, as his name appears on a list of persons not to be received by the King's commissioners into his peace until further orders. After King John's death, William de Mortimer was re-seised of all his lands. In 1238 he was steward of Earl Warenne, of whom he held, in 1242, Attleborough, Scoulton, and other Norfolk manors. The identity of his wife nor the date of his death is known.

e. In the Barons' rebellion of 1263, he was of the King's party. He was dead in 1265.

f. A minor at his father's death, his wardship was given to Earl Warenne, and in 1280 the Earl released to him all his claim in the manor of Scoulton. He was summoned, with others, 8 Jun 1294, to attend the King to advise on affairs of State, and was also summoned to the Parliament of Salisbury, 26 Jan 1296/97. He was summoned to military service in Gascony in 1294, and the following year he was made warden for the defence of the Norfolk coast. He was taken prisoner while serving in Gascony 1296-1297 and was sent with other prisoners to Paris. He is believed to have been released and died in England the latter year, on Tuesday, 12 Nov. His widow, Alice, to whom dower was assigned 14 Jan 1297/98, married John de Thorp, and was still living in 1302, when they held as dower one fee in Scoulton, Ellingham and Tofts of Constantine de Mortimer.

g. He was aged 16 to 18 at his father's death, and was in ward to John, Earl of Warenne. He was summoned for service against the Scots 1301, 1315, and 1333, and was returned as a Knight of the Shire for Norfolk to 15 Parliaments between 1321 and 1338. In Jan 1307/08 he had letters of protection for going abroad in the retinue of John, Earl of Warenne, who accompanied Edward II to France for his marriage with Isabel, daughter of Philip IV of France. He fought at the battle of Boroughbridge 16 Mar 1321/22 for the King against Thomas, Earl of Lancaster, and in 1325 was appointed joint keeper of the coasts of Norfolk and Suffolk, keeper of Buckenham Castle, and commissioner of array and of the peace in those counties. In Apr 1332, he was steward of the household of Eleanor, Duchess of Guelders (the King's sister), and in 1337 keeper of the household of Thomas of Brotherton, Earl of Norfolk. He married firstly Sibyl, who died 9 Nov 1334, and secondly, Catherine, in or before 1342. He died between Apr 1358 and 9 Aug 1359.

h. Second, but first surviving son, he was employed on various commissions. On 16 Aug 1359 he made a settlement in trust of his manors at Attleborough, Scoulton, and Barnham. He is said to have married twice, to women both named Margery; first wife, Margery Fastolf, died in 1341, and second wife, Margery -?-, who survived him.

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SOURCES:
CP: Vol IX[243-250]; SGM: Rosie Bevan [ref: Blomefield, Vol 1:375].

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