Britain's Royal Families: The Complete Genealogy by Alison Weir Page B

for treason, and styled Earl of Lancaster from 26 October, 1326, being restored formally to that earldom on 3 February, 1327. He succeeded his brother John as Lord of Beaufort and Nogent in France in 1336 (?). Henry died on 22 September, 1345, at Leicester, and was buried in Newark Abbey, Leicester.
Henry married, before 2 March, 1297 (although no evidence exists as to where):
Matilda
She was the daughter of Sir Patrick de Chaworth of Kidwelly, by Isabella, daughter of William de Beauchamp, 1st Earl of Warwick. She was born in 1282 or 1288, and died before 3 December, 1322, being buried at Mottisfont Priory.
Issue of marriage:

(a)
Henry
He was born between 1299 and 1314 at Grosmont Castle, Monmouthshire. He was created Earl of Derby on 16 March, 1337, and succeeded his father as Earl of Lancaster, Earl of Leicester and Lord of Beaufort and Nogent on 22 September, 1345. He was made a Knight of the Garter in 1348, created Earl of Lincoln on 20 August, 1349, and created Duke of Lancaster on 6 March, 1351. He was created Earl of Moray on 5 April, 1359, but never so styled. Henry died on 23/24 March, 1361, at Leicester Castle of the Black Death (bubonic plague), and was buried in Newark Abbey, Leicester.
Henry married, in c. 1334/7 (although no record exists as to where):
Isabella
She was the daughter of Henry, 1st Baron de Beaumont and Earl of Buchan, by Alice, daughter of Sir Alexander Comyn. She died in 1361 at Leicester of the Black Death (bubonic plague), and was buried in Newark Abbey, Leicester.
Issue of marriage:

(i)
Matilda
She was born on 4 April, c. 1339 or 1341. She married firstly Ralph de Stafford ( d .1347/9) on 1 November, 1344. She married secondly William V, Duke of Bavaria, Count of Holland, Hainault and Zeeland (1327–1389), in 1352 at the King’s Chapel in the Palace of Westminster. She succeeded her father as Countess of Leicester on 23 March, 1361, but died on 10 April, 1362, in England, of the Black Death (bubonic plague) (although some sources say she was poisoned).
(ii)
Blanche
She married John of Gaunt, Duke of Lancaster (under Edward III, see here ).

(b)
Blanche
She was born in c .1305, and married Thomas Wake, 2nd Baron Wake of Liddell ( d .1349) before 9 October, 1316. She died on 10 July, 1380, and was buried in the Church of the Friars Minor, Stamford, Lines.
(c)
Matilda
She was born in c .1310. She married firstly William de Burgh, 3rd Earl of Ulster (1312–1333), after 1 May, 1327 (date of dispensation), and before 1330, and had issue:
1  Elizabeth; she married Lionel of Antwerp, Duke of Clarence (under Edward III, see here ).
Matilda married secondly Ralph de Ufford ( d .1346) before 8 August, 1343, and had issue:
2  Matilda ( d .1413); she married Thomas de Vere, 8th Earl of Oxford (1336?–1371), and had issue.
Matilda became an Augustinian Canoness at Campsey Abbey, Suffolk (?), between 8 August, 1347, and 25 April,1348; she transferred to the Poor Clares at Bruisyard Abbey, Suffolk (?), in 1364. She died before 5 May, 1377, at Campsey Abbey, Suffolk (?), and was buried in Bruisyard Abbey, Suffolk.
(d)
Joan
She was born in c .1312. She married John, 3rd Baron Mowbray, Lord of Axholme, Bramber and Gower (1310–1361), after 28 February, 1327, and had issue:
1  John, 4th Baron Mowbray (1340–killed 1368); he married Elizabeth (1338–by 1368), daughter of John, 4th Baron de Segrave, by Margaret, Duchess of Norfolk (under Edward I, see here ), and had issue.
2  Blanche ( d .1409); she either married John de Segrave of Folkestone ( d .1349) and had issue, or married firstly Robert, Baron Bertram of Bothall ( d .1363/4), secondly Thomas, Baron Poynings ( d .1375), thirdly Sir John Worth ( d .1391) and fourthly Sir John Wiltshire.
3  Eleanor ( d.c. 1387); she married firstly Roger, Baron de la Warre (1326–1370), and secondly Sir Lewis de Clifford ( d .1404).
Joan died on 7 July, 1345 (?) or 1349 (?), and was buried in Byland Abbey, Yorkshire.
(e)
Isabella
She was born in c .1317,