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.
Hugh de Lacy, 1st Earl of Ulster
Hugh de Lacy, 1st Earl of Ulster (c. 1176after 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.
Hugh de Vere, 4th Earl of Oxford
Hugh de Vere, 4th Earl of Oxford( c. 1207 – December 1263) was the only son and heir of Robert de Vere, 3rd Earl of Oxford and Isabel de Bolebec, daughter and eventual sole heiress of Hugh de Bolebec.
Walter de Riddlesford
Walter de Riddlesford(" fl." 1150 – d. 1226) was an Anglo- Norman lord granted in Ireland the baronies of Bray, County Wicklow and Kilkea, County Kildare between 1171 and 1176.
De Riddlesford was born in Carriebenan, Kildare, Ireland.
He married a daughter of Henry fitz Henry named Amabilis Fitzhenry.
He built a motte and bailey fortress on the site of what is now Kilkea Castle in County Kildare in 1181.
He died in 1226 and was succeeded by his son Walter.
His granddaughter, Emmeline, married Hugh de Lacy, 1st Earl of Ulster( as his second wife) and, then, Stephen Longespee, son of William Longespée, 3rd Earl of Salisbury and grandson of Henry II of England( one of their daughters was Ela Longespee).
Margaret de Stafford
Margaret Stafford( born c. 1364; died 9 June 1396) was the daughter of Hugh de Stafford, 2nd Earl of Stafford, and Philippa de Beauchamp.
She was the first wife of Ralph Neville, 1st Earl of Westmorland, and the grandmother of the 2nd Earl.
Walter de Lacy, Lord of Meath
Walter de Lacy( c. 1172–1241) was lord of Meath in Ireland.
He was also a substantial land owner in Weobley, Herefordshire, in Ludlow, Shropshire, in Ewyas Lacy in the Welsh Marches, and several lands in Normandy.
He was the eldest son of Hugh de Lacy, a leading Cambro- Norman baron in the Norman invasion of Ireland.
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, Lord of Meath
Hugh de Lacy, Lord of Meath, 4th Baron Lacy (born before 1135, died 25 July 1186), was an Anglo-Norman landowner and royal office-holder.
He had substantial land holdings in Herefordshire and Shropshire, England.
Following his participation in the Norman Invasion of Ireland, he was granted, in 1172, the lands of the Kingdom of Meath by the Anglo-Norman King Henry II, but he had to gain control of them.
The Lordship of Meath was then the most extensive liberty in Ireland.
Maud de Lacy, Countess of Hertford and Gloucester
Maud de Lacy,( 25 January 1223 – 10 March 1289), was an English noblewoman, being the eldest child of John de Lacy, 2nd Earl of Lincoln, and the wife of Richard de Clare, 5th Earl of Hertford, 6th Earl of Gloucester.
Miles de Angulo
Miles de Angulo, aka Miles Bregach Mac Goisdelbh, Anglo- Irish knight and baron, fl. 1245 – 1259.
Son of Phillip fitz William de Angulo.
Called by the Irish' Mac Goisdelbh'( i.e., the son of Jocelyn).
Walter de Lacy gave a grant of Conmaicne to the Lord of Navan and Miles fought for him there.
He built Athachip castle in 1245, but was driven out in 1247.
He later became the lord of Sliabh Lugha in Castlemore, in what would later be called the barony of Costello.
Miles was married to a daughter of Hugh de Lacy, 1st Earl of Ulster; upon her death, she was buried at Boyle Abbey, in County Roscommon.
Miles died in 1259.
He had sons Hugh( died 1260?), Gilbert Mor and Phillip( died 1288).

Question: When did Hugh De Lacy, 1St Earl Of Ulster's father die?
Answer: 25 July 1186