Rose Ní Conchobair
Rose Ní Conchobair, Princess of Connacht and Ireland, Lady of Meath, fl. 1180.
Rose was one of some thirteen children of King of Ireland, Ruaidrí Ua Conchobair.
About 1180 she married Hugh de Lacy, Lord of Meath( before 1179 to 1242).
De Lacy had five daughters and two sons by his first wife Rose de Monmouth.
Rose Ní Conchobair was the mother of two more children, William Gorm de Lacy and Ysota de Lacy.
Hugh de Lacy, 1st Earl of Ulster
Hugh de Lacy, 1st Earl of Ulster( c. 1176 a fter December 26, 1242) was an Anglo- Norman soldier and peer.
He was a leading figure in the Norman invasion of Ireland in the 12th century, and was created Earl of Ulster in 1205 by King John of England.
De Lacy was the younger son of Hugh de Lacy, Lord of Meath, a descendant of Walter de Lacy, who went to England after the Norman conquest.
Around 1189, he was appointed Viceroy of Ireland, a position previously held by his father.
He was replaced in 1190 by Guillaume le Petil.
He was later reappointed to serve as viceroy from 1205 to 1210.
Egidia de Lacy, Lady of Connacht
Egidia de Lacy, Lady of Connacht( born c. 1205), was a Cambro- Norman noblewoman, the wife of Richard Mór de Burgh, 1st Baron of Connaught and Strathearn( c.1194 – 1242), and the mother of his seven children, including Walter de Burgh, 1st Earl of Ulster.
She was also known as Gille de Lacy.
Egidia was the daughter of Walter II de Lacy by his second wife Margaret de Braose.
George de Cantilupe
George de Cantilupe( 1252–1273)( anciently" Cantelow, Cantelou, Canteloupe, etc", Latinised to" de Cantilupo") was Lord of Abergavenny from the Marches of South Wales under Edward I of England.
He was born on the 29 March 1252 at Abergavenny Castle in Monmouthshire, the son of William III de Cantilupe and Eva de Braose.
He married Margaret de Lacy, of the powerful de Lacy dynasty, daughter of Edmund de Lacy, 2nd Earl of Lincoln and his wife Alasia di Saluzzo, daughter of Manfredo III, Marchese di Saluzzo and Beatrix di Savoia.
He was named a Knights Bachelor on October 13, 1272.
His other estates, apart from Abergavenny, included the manor of Bridgwater in Somerset.
He died on 18 October 1273, aged 21.
He was succeeded by his nephew John Hastings, 1st Baron Hastings.
Richard fitz Eustace
Richard fitz Eustace was a prominent 12 th- century noble.
He was a son of Eustace fitz John and Agnes de Halton.
He inherited the titles of his mother, becoming Baron of Halton, and the position of Constable of Chester.
Richard died c. 1163.
Richard had in the reign of King Henry II of England one knight's fee in Smathe, Yorkshire.
His second wife Albreda de Lissours, would inherit after Richard's death the barony of Pontefract from her mother Albreda de Lacy, the daughter of Robert de Lacy, Baron of Pontefract.
Albreda married William FitzWilliams, after the death of Richard and had issue.
Henry de Lacy, 3rd Earl of Lincoln
Henry de Lacy, 3rd Earl of Lincoln, Baron of Pontefract( c. 1251 February 1311) was an English nobleman and confidant of King Edward I' Longshanks'.
He served Edward in Wales, France, and Scotland, both as a soldier and a diplomat.
John de Lacy, 2nd Earl of Lincoln
John de Lacy (– 22 July 1240) was the 2nd Earl of Lincoln, of the fourth creation.
Gilbert de Lacy
Gilbert de Lacy( died after 1163) was a medieval Anglo- Norman baron in England, the grandson of Walter de Lacy who died in 1085.
Gilbert's father forfeited his English lands in 1096, and Gilbert initially only inherited the lands in Normandy.
The younger de Lacy spent much of his life trying to recover his father's English lands, and eventually succeeded.
Around 1158, de Lacy became a Templar and went to the Holy Land, where he was one of the commanders against Nur ad- Din in the early 1160s.
He died after 1163.
Edmund de Lacy, Baron of Pontefract
Edmund de Lacy (c.1230–1258) was the son of John de Lacy, 2nd Earl of Lincoln.
When his father died in 1240 he inherited his father's titles and lands which included Baron of Pontefract, Baron of Halton, Lord of Bowland, and Constable of Chester.
As he was a minor his inheritance was held by him in wardship by his mother.
Normally his inheritance would have been held in wardship until he reached the age of majority (21).
However, Edmund was allowed to succeed his father at only 18 years of age.
He was heir to his mother Margaret de Quincy and on her death would have inherited the Earldom of Lincoln that vested in her.
(His father had only been Earl by rights of his wife.)
As he predeceased his mother he never became the Earl of Lincoln.
Roger de Lacy (1170–1211)
Roger de Lacy( 1170 – 1211), Baron of Pontefract, Lord of Bowland, Lord of Blackburnshire, Baron of Halton, Constable of Chester, Sheriff of Yorkshire and Cumberland, also known as Roger le Constable, was a notable English soldier, crusader and baron in the late 12th and early 13th centuries.

Question: What is the date of death of Edmund De Lacy, Baron Of Pontefract's father?
Answer: 22 July 1240