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

daughter of Robert IV, Count of Dreux, and widow of Alexander III, King of Scotland, and had issue.
    2  John, Earl of Richmond (1266?–1334).
    3  Peter, Count of Léon ( d .1312).
    4  Mary (1268–1339); she married Guy de Châtillon, Count of St Pol, and had issue.
    5  Eleanor or Alice (1274–1329?); she became a nun at Amesbury Abbey, Wiltshire, and later Abbess of Fontevrault, France.
    6  Blanche ( d .1327); she married Philip, Count of Artois, Lord of Conches and Domfront ( d .1298), and had issue.
    7  Henry ( d . young, 1284).
    Beatrice died on 24 March, 1275, in London; she was perhaps buried in Reading Abbey, Berkshire, and probably removed later to Greyfriars Church, Newgate, London. Her tomb was lost during the Reformation.
    4   Edmund
    Known as ‘Crouchback’, he was born on 16 January, 1245, in London. He was nominated King of Sicily by the Pope on 7 January, 1254, but deprived of that kingdom in 1263. He was created Earl of Leicester on 26 October, 1265, and Earl of Lancaster on 30 June, 1267. He became Count of Champagne and Brie in right of his second wife in 1276. Edmund died on 5 June, 1296, at Bayonne, and was buried in Westminster Abbey.
    Edmund married firstly, on 8/9 April, 1269, in the newly-rebuilt Westminster Abbey:
    Aveline
    She was the daughter of William de Forz or Fortibus, 6th Earl of Aumale, by Isabella, daughter of Baldwin de Redvers, 7th Earl of Devon. She was born on 20 January, 1259, at Burstwick, Yorkshire, and succeeded her brother as Countess of Aumale before 6 April,1269. She died on 10 November, 1274, at Stockwell, Surrey, and was buried in Westminster Abbey; hers was the first tomb in the new church. There was no issue of her marriage to Edmund.
    Edmund married secondly, in January (before 3 February), 1276, or between 27 July and 29 October, 1276 (although no evidence exists as to where):
    Blanche
    She was the daughter of Robert I, Count of Artois, by Matilda, daughter of Henry II, Duke of Brabant, and she was born around c .1245/50. She married firstly Henry I, King of Navarre and Count of Champagne ( d .1274), in 1269, and had issue:

1  Joan, Queen of Navarre (1273–1305); she married Philip IV, King of France (1268–1314), and had issue, including Isabella, wife of Edward II.
    2  Theobald ( d .young).
    Blanche died on 2 May, 1302, in Paris, and was probably buried in the Minoresses Convent, Aldgate, London.
    Issue of marriage:

(i)
Thomas
He was born around 1277/80. He became Earl of Lincoln in right of his wife on or before 28 October, 1294. He succeeded his father as Earl of Lancaster and Leicester on 8 September, 1298. He was styled Earl Ferrers (Derby) from 1301. He renounced the earldom of Lincoln when he divorced his wife in c .1318. Thomas was executed on 22 March, 1322, at Pontefract, Yorkshire, by order of Edward II. He was buried in the Priory of St John at Pontefract.
Thomas married, on or before 28 October, 1294 (?), or perhaps as late as c. 1310 (although no record exists as to where):
Alice
She was the daughter of Henry de Lacy, 3rd Earl of Lincoln, by Margaret, daughter of Sir William Longespee of Amesbury, Wiltshire, a descendant of Henry II. Alice was born on 25 December, 1281, probably at Denbigh Castle, Denbighshire, and succeeded her father as Countess of Lincoln on 5 February, 1311; she succeeded her mother as Countess of Salisbury before 20 September, 1311. Lancaster divorced her in c .1318 on account of her adultery with the Earl of Surrey’s squire, Sir Eubulo Lestraunge, whom she married as her second husband before 10 November, 1324. Eubulo died in 1335. Alice married thirdly Hugh de Freyne, Baron Freyne ( d. 1336/7), before 23 March, 1336. She died on 2 October, 1348, and was buried in Barlings Abbey, Birling, Kent. She had no issue from any of her marriages.
(ii)
Henry
He was born in c .1281 at Grosmont Castle, Monmouthshire. He was restored to the earldom of Leicester on 29 March, 1324, two years after his brother’s execution