de Burgh of Ireland
Sir William de Burgh [a], Lord of Connaught, b abt 1160, Ireland, d 1205. He md Daughter O'Brien abt 1180, daughter of Donnell O'Brien. She was b abt 1166, Ireland.
Child of William de Burgh and Daughter O'Brien was:

Sir Richard de Burgh [b], Lord of Connaught, Lord Lieut. of Ireland, "the Great", b 1198, Belfast, Antrim, Ireland, d bef 17 Feb 1242/43, Gascony, France. He md Egidia/Jill de Lacy 21 Apr 1225, Antrim, Ireland, daughter of Sir Walter de Lacy, Lord of Meath and Weobley, and Margaret/Margery de Braose.
Children of Richard de Burgh and Egidia/Jill de Lacy were:

Sir Walter de Burgh, Earl of Ulster, b abt 1232, d 28 Jul 1271. He md Aveline Fitz John abt 1255, daughter of Sir John FitzGeoffrey, Justiciar of Ireland, Knight, and Isabel Bigod.
Child of Walter de Burgh and Isabel Bigod was:

Sir Richard de Burgh, Earl of Ulster, b abt 1259, d 29 Jul 1326. He md (perhaps) Margaret of Guines bef 27 Feb 1280/81, daughter of Arnold/Arnoul III of Guines, Count of Guines.
Child of Richard de Burgh and Margaret of Guines was:

Sir John de Burgh b abt 1290, d 18 Jun 1313. He md Elizabeth de Clare 30 Sep 1308, daughter of Sir Gilbert de Clare, Earl of Gloucester and Hertford, Lord Clare, Knight, and Joan of Acre Plantagenet.
Child of John de Burgh and Elizabeth de Clare was:

Sir William de Burgh, Earl of Ulster, b 17 Sep 1312, d 6 Jun 1333 (murdered). He md Maud de Lancaster aft 1 May 1327, daughter of Sir Henry of Lancaster, Earl of Lancaster, and Maud de Chaworth.
Child of William de Burgh and Maud de Lancaster was:

Elizabeth de Burgh b abt 1340. She md Sir Lionel of Antwerp Plantagenet, Earl of Ulster, Duke of Clarence, 1352, son of Edward III Plantagenet, King of England, and Philippa of Hainault.

a. He was the brother, probably elder, of Hubert de Burgh. Their parentage has not been ascertained, although it is recorded that Hubert's mother was named Alice. Their father may have been one Walter de Burgh of Burgh-next-Aylsham, Norfolk.

b. He had issue: (1) Richard, who died s.p. 1248; (2) Walter, Earl of Ulster; (3) William who died 1270, leaving a son William Liath; (4) Margery, who married Theobald Butler and was living 1 Mar 1252/53; (5) a daughter who was second wife of Gerald de Prendergast, by whom she had a daughter, aged 10 in Mar 1252; (6) Alice, who was to have dower from the lands of Muriardach Hobren, 17 Feb 1241/42; and (7) a daughter, who married Hamon de Valoynes, by whom she was mother of Mabel, wife of John de Mareys (Marsh/Marisco).

CP: Vol II[449] XII/2[171-172]; AR: Line 40[30], Line 73[30], Line 75 [31-32], Line 75A[30-31], Line 94A-31], Line 177B[8-9].
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