Baldwin IV, Count of Hainaut
Baldwin IV( 1108 – 8 November 1171) was count of Hainaut from 1120 to his death.
He was the son of Baldwin III, Count of Hainaut, and Yolande de Wassenberg.
Baldwin III, Count of Hainaut
Baldwin III( 1088–1120) was count of Hainaut from 1098 to his death.
He was son of Baldwin II, Count of Hainaut, and Ida of Louvain.
Adelolf, Count of Boulogne
Adelolf, Count of Boulogne( † 933), was a younger brother of Arnulf I, Count of Flanders and was given the County of Boulogne by his father.
He was a son of Baldwin II, Count of Flanders, and of Ælfthryth, daughter of Alfred the Great.
He was probably named for his maternal great- grandfather, King Æthelwulf of Wessex.
Baldwin II's extensive lands and many offices in what is now the north of modern France and the west of Belgium were divided among his sons on his death in 918.
The elder, Arnulf, became Count of Flanders while Adelolf succeeded his father as count of Saint- Pol, Count of Boulogne and of Thérouanne.
He was also the lay abbot of the Abbey of Saint Bertinus( Saint- Bertin) at Saint- Omer.
In 926 Adelolf was sent as an ambassador to his maternal first cousin King Æthelstan of England by Count Hugh the Great, effective ruler of northern France under Rudolph, Duke of Burgundy, who had been elected king of France in 923.
Adelolf was to seek the English king's agreement to a marriage between Hugh and another of Æthelstan's sisters.
Among the lavish gifts sent to Æthelstan, an avid collector of relics, were said to be the sword of the Roman Emperor Constantine the Great and the Holy Lance.
The embassy was a success and Hugh was married to Æthelstan's half- sister Eadhild.
In 933, Æthelstan's half- brother Edwin was drowned and his body cast ashore.
Adelolf received the body of his kinsman with honour and took it to the Abbey of Saint Bertin for burial.
Adelolf was the father of Arnulf II, Count of Boulogne( † 971), and of an illegitimate son named Baldwin( died 973) who was guardian of Arnulf II, Count of Flanders.
Adelolf died in 933.
He was buried at Saint- Bertin.
Baldwin II, Count of Hainaut
Baldwin II of Mons (1056–1098?) was count of Hainaut from 1071 to his death.
He was the younger son of Baldwin VI, Count of Flanders and Richilde, Countess of Mons and Hainaut.
Reginar II, Count of Hainaut
Reginar II( 890–932) was Count of Hainaut( also written Rainier II, Count of Hainault) from 915 until 932.
Mary of Avesnes
Marie of Hainaut( 1280–1354) was the daughter of John II, Count of Holland and Philippa of Luxembourg, her brother was William I, Count of Hainaut.
Baldwin II, Count of Guînes
Sir Baldwin II, Count of Guînes( died 2 January 1205), was a French nobleman.
Baldwin VI, Count of Flanders
Baldwin VI (– 17 July 1070), also known as Baldwin the Good, was Count of Hainaut from 1051 to 1070 (as Baldwin I) and Count of Flanders from 1067 to 1070.
Richilde, Countess of Hainaut
Richilde, Countess of Mons and Hainaut( – 15 March 1086), was a ruling countess of Hainaut from c. 1050 until 1076, in co-regency with her husband Baldwin VI, Count of Flanders and son Baldwin II, Count of Hainaut.
She was also countess consort of Flanders by marriage to Baldwin VI, Count of Flanders.
She served as regent of Flanders during the minority of her son Arnulf III, Count of Flanders in 1070- 1071.
Marie of Brienne
Marie of Brienne( c. 1224–1275) was Latin Empress as the wife of Baldwin II of Courtenay.
She served as regent during the absence of Baldwin II twice: in 1237 – 1239, and in 1243 – 1257.

Question: When did Baldwin Ii, Count Of Hainaut's father die?
Answer: 17 July 1070