William de Montagu [b] b abt 1156, d abt 1217. He md Isabel abt 1180. She was b abt 1164.
Child of William de Montagu and Isabel was:

Sir William de Montagu [d], Knight, b abt 1214, d 23 Sep 1270. He md Bertha abt 1236. She was b abt 1222.
Child of William de Montagu and Bertha was:

Sir William de Montagu [f], Lord Montagu, Knight, b abt 1272, d 18 Oct 1319, Gascony, France. He md Elizabeth de Montfort abt 1295, daughter of Sir Piers de Montfort and Maud de la
Mare.
Identified children of William de Montagu and Elizabeth de Montfort were:

• Sir William de Montagu b abt 1302.
• Alice de Montagu b abt 1315. She md Sir Ralph Daubeney, Knight, bef 27 Jan 1332/33, son of Sir Helie/Elis Daubeney, Lord Daubeney, and Joan.

• Philippa de Montagu b abt 1332, Salisbury, Wiltshire, England, d abt 1381, Berkshire, England. She md Sir Roger de Mortimer, Earl of March, abt 1345, son of Sir Edmund de Mortimer, Earl of March, and Elizabeth de Badlesmere.
• Sibyl de Montagu b abt 1334. She md Edmund Fitz Alan bef Jul 1349, son of Sir Richard Fitz Alan, Earl of Arundel, and Isabel le Despenser.

NOTES:
a. Richard "de Monte Acuto", son of Drew (or Drogo) attested a charter of Queen Maud circa 1148. He gave land in Bishopstone and Thorne to Montacute Priory before 1160, and also made grants to Bruton Priory. He married Alice, who may have been his second wife; her parentage is not known. After his death she married Alexander de Piro.

b. He had livery of his inheritance in 1178, and he and his brother, Richard, confirmed their father's gifts to Bruton Priory. After John's succession to the throne, he became a prominent official at Court. He was custodian of Sherborne Castle and sheriff of Somerset and Dorset, 1204-1207, and a justiciar in 1208. He rebelled early in 1215, but appears to have made his peace with the Crown soon after the accession of Henry III. He was living in April, but died circa June 1217, when the custody of his lands and heir was granted to Alan Basset. His widow, Isabel, survived him.

c. Son and heir apparent, he married Aline, the daughter of his guardian, Alan Basset, and died v.p. in or before 1216. His widow married Richard Talbot.

d. Heir to his grandfather, he was still under age in 1227, and obtained possession of his lands in 1234. In 1236, he confirmed his grandfather's gift of the advowson of Shipton church to Bruton and in Jul 1244 made a grant to Christchurch in Hampshire. In 1255 he served with Prince Edward in Wales, and was summoned for service there from 1257 to 1264. He appears to have been knighted by 1258, and in 1259, and again in 1269, he made an agreement with his uncle, Philip Basset, and Ela, Philip's wife, respecting Thurlbear and other manors. At his death, custody of his lands was granted to Philip Basset.

e. Under age at his father's death, he was in prison in 1280 for a forest offense. In 1282 and later he was engaged in the Welsh wars, and in 1283 was summoned to attend the assembly at Shrewsbury. In 1290 he made a settlement of his estates by surrendering them to the King and receiving a regrant with remainders to his sons, William and Simon. In Jun 1294 he received summons to attend the King on urgent affairs concerning Gascony, where he was sent immediately, staying there until early 1297. In 1299 and many times after, he was summoned for service against the Scots, and in Sep of that year was appointed custodian of Corfe Castle. He was summoned to Parliament from 29 Dec 1299 to 16 Oct 1315, whereby he became Lord Montagu. In Jul 1300 he took part in the siege of Carlaverock, and after its capture was sent to Ireland. He was in Gascony again in Oct 1302 and was still there in 1303. On 30 Jan 1306/07 he was made captain and governor of the fleet against the Scots, and attended the coronation of Edward II 25 Feb 1307/08. He appears to have been in the new King's favor, for in 1309 he was made custodian of Beaumaris Castle, and in Aug 1310 was again admiral of the fleet against the Scots. In his later years he was appointed to various commissions. He was first married to Hawise, daughter of Amauri de St. Amand, who was deceased in 1287, and he secondly married, Isabel, whose parentage is unknown.

f. He spent much of his adult life in the wars in Scotland, Wales, and abroad. In May 1304 he was with the King at the siege of Stirling. He, along with his uncle, Amauri de St. Amand, governor of Oxford Castle, and others, were imprisoned in the Tower for an alleged offense at Oxford, but he was soon acquitted. He was ceremoniously knighted, with many others, at the knighting of Prince Edward on 22 May 1306. In 1311 he was commissioned to survey Hastings and other castles and their defenses and to provide custodians for them, and on 29 Sep he was given charge of Berkhamstead Castle. In May 1313, he accompanied the King and Queen overseas to attend the coronation of Louis X. In 1315/16 he was a commander in Wales, and in Jul 1316 was at Bristol to settle the dispute between Sir Bartholomew de Badlesmere and the burgesses. In Jun 1317, the King granted him the manors of Gravesend in Kent and Kingsbury in Somerset, and on 26 Sep he had a grant of free warren in Saxlingham, Norfolk, and other of his manors. He was summoned to Parliament 20 Nov 1317 and later, and in Aug 1318 was made keeper of Abingdon Abbey. In Nov of that year he was appointed Seneschal of Gascony, where he died the following year. His widow, Elizabeth, daughter of Sir Piers de Montfort of Beaudesert, co. Warwick, survived him, and on 8 Jun 1322, she married Sir Thomas de Furnival, whom she survived.

g. He was aged 17 to 18 in May 1320 and succeeded his father 18 Oct 1319. He was knighted in 1326, and summoned for service in Scotland 1327. In May 1329 he attended the King at Amiens and beginning in Jun he began his successful service as the King's diplomatist. He was a prime force in the seizure of Mortimer in 1330, for which his reward included the castle and lordship of Denbigh, as well as other lands formerly held by Mortimer. In 1333 he was in command of the siege of Berwick, and from Mar 1333/34 to May 1337 was joint keeper, with Henry de Ferrers, of the Channel Islands. He was with the King in Scotland 1335 and 1336, and in Jan 1336/37 was appointed Admiral from the mouth of the Thames westwards. On 16 Mar 1336/37 he was created Earl of Salisbury, and the following Oct was joint commander in Scotland, as well as a commissioner to treat for a peace, and in Dec sole commissioner to deal with John of the Isles for a treaty. He accompanied the King to Flanders in Jul 1338, and on 20 Sep at Antwerp, he was made Marshal of England for life. In Dec of 1339 he remained as hostage to the Duke of Lorraine while the King returned to England, and in Aug 1343, with the Earl of Suffolk, he went on an embassy to Castile, where he is said to have fought the Moors. He died the following Jan and was buried at Bisham, which he had founded. In addition to sons William and John, he and wife Katherine de Grandison had four daughters, (1) Sibyl, who married Edmund de Arundel; (2) Philippe, who married Roger de Mortimer, Earl of March; (3) Elizabeth who married Giles de Badlesmere, Hugh le Despenser, and Guy de Bryan; and (4) Agnes, who married John de Grey.

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SOURCES:
CP: Vol IX[75-82], Vol XI[385-388]; AR: Line 8A[31], Line 28[34].

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