Matthew, Count of Boulogne
Matthew, Count of Boulogne, also known as" Matthew of Alsace"( – 1173) was the second son of Thierry, Count of Flanders and Sibylla of Anjou.
Matthew forcibly abducted the nun Marie de Boulogne, daughter of Stephen, King of England, and constrained her into marriage, claiming the title of Count of Boulogne in 1160.
The forced marriage was opposed by the Church and finally annulled in 1170, but he continued to rule as Count until his death.
Matthew and Marie had 2 daughters: Ida, Countess of Boulogne, and Maud of Boulogne.
Maud married Henry I, Duke of Brabant.
In 1171, Matthew married Eleanor, daughter of Ralph I, Count of Vermandois, they had one short- lived daughter.
He was a supporter of Henry the Young King, and received lands in England.
He died fighting at the siege of Trenton( now Neufchatel- en- Bray), in the 1173 – 74 revolt of Henry II of England's sons, under the leadership of Philip of Flanders.
Wounded by a crossbow bolt, he did not recover.
Arnulf III, Count of Boulogne
Arnulf III of Boulogne( † 990) was a son of Arnulf II, Count of Boulogne.
He succeeded his father as count of Boulogne from 972 to 990.
On his death his lands were divided between his three sons:
Matilda of Boulogne, Duchess of Brabant
Matilda of Boulogne
( 1170 – 16 October 1210) was the younger daughter of Matthew, Count of Boulogne and Marie I, Countess of Boulogne.
Matilda became Duchess of Brabant by her marriage to Henry I, Duke of Brabant.
Matilda's parents' marriage was annulled the year she was born and her mother became a Benedictine nun at St. Austrebert, Montreuil and died in 1182.
Matilde's father continued to reign as Count of Boulogne until his death in 1173, when her older sister Ida became countess.
At the age of nine, Matilda married Henry I, Duke of Brabant, in 1179.
The couple went on to have: Matilde died in 1210 or 1211.
She was buried at St. Peter's in Leuven.
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.
Eustace I, Count of Boulogne
Eustace I, Count of Boulogne, was a nobleman and founder of the Boulogne branch of the House of Flanders.
He held the county of Boulogne from 1024 until his death in 1049.
Ida, Countess of Boulogne
Ida of Boulogne( c. 1160 – 1216) was suo jure Countess of Boulogne from 1173 until her death.
Baldwin II, Count of Boulogne
Baldwin II of Boulogne was a son of Arnulf III, Count of Boulogne, whom he succeeded as count of Boulogne.
Matilda II, Countess of Boulogne
Mahaut or Matilda II of Boulogne( also known as" Mathilde Maud de Dammartin"; 1202 – January 1259) was Countess of Boulogne in her own right and Queen of Portugal by marriage to King Afonso III from 1248 until their divorce in 1253.
She was the daughter of Ida, Countess of Boulogne and her husband and co-ruler Renaud, Count of Dammartin.
She succeeded her mother as Countess of Boulogne in 1216.
She was the great- granddaughter of King Stephen of England.
Adelina of Holland
Adelina of Holland was possibly a daughter of Arnulf, Count of Holland, and Lutgardis of Luxemburg.
She married firstly Baldwin II, Count of Boulogne( with whom she had Eustace I of Boulogne), and secondly Enguerrand I of Ponthieu.
Arnulf II, Count of Boulogne
Arnulf II of Boulogne († 972) was a son of Count Adalolf.
He succeeded as Count of Boulogne in 964 after the death of his uncle Arnulf I, and held it until his own death.
He was the father of Arnulf III, Count of Boulogne.
He is the ancestor of Ruler of Jerusalem Godfrey of Bouillon.

Question: Who is the grandchild of Adelolf, Count Of Boulogne?
Answer: Arnulf III, Count of Boulogne