Thomas de Clare, Lord of Thomond
Thomas de Clare, 1st Lord of Thomond, 1st Lord of Inchiquin and Youghal (1244×124729 August 1287) was a Hiberno-Norman peer and soldier.
He was the second son of Richard de Clare, 6th Earl of Gloucester and his wife Maud de Lacy, Countess of Gloucester.
In 1272 he served a term as Lieutenant of the Duchy of Aquitaine.
On 26 January 1276 he was granted the Lordship of Thomond by Edward I of England; he spent the next eight years attempting to conquer it from the O'Brien dynasty, kings of Thomond.
Eleanor de Clare
Eleanor de Clare, suo jure 6th Lady of Glamorgan( 3 October 1292- 30 June 1337) was a powerful English noblewoman who married Hugh Despenser the Younger and was a granddaughter of Edward I of England.
With her sisters, Elizabeth de Clare and Margaret de Clare, she inherited her father's estates after the death of her brother, Gilbert de Clare, 8th Earl of Gloucester, 7th Earl of Hereford at the Battle of Bannockburn in 1314.
She was born in 1292 at Caerphilly Castle in Glamorgan, Wales and was the eldest daughter of Gilbert de Clare, 6th Earl of Hertford, 7th Earl of Gloucester, 5th Lord of Glamorgan and Princess Joan of Acre.
Richard de Clare, 6th Earl of Gloucester
Richard de Clare, 5th Earl of Hertford, 6th Earl of Gloucester, 2nd Lord of Glamorgan, 8th Lord of Clare (4 August 1222 – 14 July 1262) was son of Gilbert de Clare, 4th Earl of Hertford and Isabel Marshal.
He was also a powerful Marcher Lord in Wales and inherited the Lordship of Glamorgan upon the death of his father.
He played a prominent role in the constitutional crisis of 1258–1263.
Maud de Clare
Maud de Clare, Baroness de Welles was the eldest daughter of Thomas de Clare, Lord of Inchiquin and Youghal, Lord of Thomond, Lord of Bunratty Castle( 1245 – 1287) and Juliana FitzGerald( 1236–1290).
She married two times.
Her first marriage was to Robert de Clifford, 1st Baron de Clifford, 1st Lord of Skipton( 1274 – 1314) on 3 November 1295 by which she had four children.
Her second marriage was to Sir Robert de Welles, 2nd Baron Welles, Constable of Pendragon Castle( 1297 – 1326) on 16 Nov 1315.
They had no children.
She was born in 1276 in Tewkesbury, Tewkesbury Hundred, Gloucestershire, England and moved to Badlesmere to be near her sister, Margaret de Clare, Baroness Badlesmere.
She died in Badlesmere in 1327 twice a widow.
Juliana FitzGerald, Lady of Thomond
Juliana FitzMaurice, Lady of Thomond (12 April 1266 - 29 September 1300) was a Norman-Irish noblewoman, the daughter of Maurice FitzGerald, 3rd Lord of Offaly, and the wife of Thomas de Clare, Lord of Thomond, a powerful Anglo-Norman baron in Ireland, who was a younger brother of Gilbert de Clare, 6th Earl of Hertford.
Juliana was married three times; Thomas being her first.
She is sometimes referred to as Juliane FitzMaurice.
Robert de Welles, 2nd Baron Welles
Robert de Welles, 2nd Baron de Welles, Constable of Pendragon Castle was the son of Adam de Welles, 1st Lord of Welles( 1249 – 1311) and Joan d'Engayne( 1265 – 1315).
He married Maud de Clare, daughter of Thomas de Clare, Lord of Thomond( 1245 – 1287) in 1315 without royal licence.
It is said that he did, in fact, have a daughter by Maud de Clare, but historical evidence remains elusive.
The Barony de Welles passed to his brother, Adam de Welles, 3rd Baron Welles( 1304 – 1345) on his death.
He is buried at Greenfield Priory, Greenfield, East Lindsey District, Lincolnshire, England.
Roger Clifford, 2nd Baron Clifford
Roger de Clifford, 2nd Baron de Clifford, also 2nd Lord of Skipton( 21 January 1300 – 23 March 1322) was a member of the Clifford family which held the seat of Skipton from 1310 to 1676.
He inherited his title when his father, Robert de Clifford, 1st Baron de Clifford died at the Battle of Bannockburn in 1314.
His mother was Maud de Clare, eldest daughter of Thomas de Clare, Lord of Thomond and Juliana FitzGerald.
Roger was also hereditary High Sheriff of Westmorland.
He was involved in a rebellion against King Edward II's favourite Hugh, Lord de Despencer, and ultimately against the King himself.
He took part in the Siege of Tickhill.
The rebel forces were then brought to battle by the King's forces in Boroughbridge in March 1322 at which Roger Clifford received severe wounds.
Forced to surrender, he was condemned to death and held captive in York.
He was hanged there, probably on 23 March, and his estates forfeited, including Skipton castle.
They were restored to Robert Clifford, 3rd Lord of Skipton in 1327.
Richard de Clare, Steward of Forest of Essex
Richard de Clare( after 1281 – 10 May 1318) 1st Lord Clare was the son of Thomas de Clare, Lord of Thomond and Juliana FitzGerald.
A descendant of Strongbow, he succeeded his older brother, Gilbert, in 1308 as Lord of Thomond.
In 1309, and then again between 1312 and 1316, he was sheriff of Cork.
Forced to put down a number of rebellions, he was eventually killed while commanding his forces at the Battle of Dysert O' Dea near what is now Ennis, County Clare.
According to legend, the day before his death, Richard de Clare beheld a woman dressed in white on the river's edge washing bloody clothing and armor.
When he asked whose clothes they were, she replied," yours," and then vanished.
This woman was believed to be a banshee foretelling his death the next day when he lay dead with his clothes caked in blood on the battlefield of Dysert O' Dea( Lewis Spence, The Magical Arts in Celtic Britain 81(1999)).
Richard was succeeded by his son Thomas, who was born in 1318 and died three years later.
A series of inquisitions post mortem that were held following a writ issued on 10 April 1321 established that Thomas' heirs were his father's sisters; Margaret, the wife of Bartholomew de Badlesmere and Maud, the wife of Sir Robert de Welle.
As well as stewardship of the Forest of Essex, Thomas' estate included numerous properties in Ireland.
Toirdhealbhach Mór Ó Briain
Toirdhealbhach Mór Ó Briain was King of Thomond( 1276- 1306) and the main protagonist of Seán mac Ruaidhri Mac Craith's epic Cathreim Thoirdhealbhaigh describing his struggles against the Norman Thomas de Clare.
Bogo de Clare
Bogo de Clare (21 July 1248 – October 1294) was a member of the Anglo-Norman de Clare family, as third son of Richard de Clare (1222–1262), 5th Earl of Hertford and 6th Earl of Gloucester.

Question: Who is Thomas De Clare, Lord Of Thomond's paternal grandmother?
Answer: Isabel Marshal