Hugh I, Count of Clermont-en-Beauvaisis
Hugh I, Count of Clermont-en-Beauvaisis (1030–1101), son of Renaud I of Clermont (1010–1088), son-in-law of Baldwin II of Clermont, the second known Count of Clermont.
Hugh was an early founder of the House of Clermont.
Hugh married Marguerite de Ramerupt, daughter of Hilduin IV, Count of Montdidier, and his wife Alice de Roucy.
Hugh and Marguerite had eight children:
Upon his death, Hugh was succeeded as Count of Clernont-en-Beauvaisis by his son Renaud.
Ebles II of Roucy
Ebles II( died May 1103), also called Eble or Ebale, was the second Count of Roucy( 1063 – 1103) of the House of Montdidier.
He was the son and successor of Hilduin IV of Montdidier and Alice( Alix), daughter of Ebles I of Roucy.
He is famous for his participation in the" Reconquista"( the war against Muslim Spain), as well as for being one of the unruly barons of the Île- de- France subjugated by King Louis VI while he was still a prince.
His life and character are summed up by Suger in his history of the reign of Louis VI:" Ebles was a man of great military prowess—indeed he became so bold that one day he set out for Spain with an army of a size fit only for a king—his feats of arms only made him more outrageous and rapacious in pillage, rape and all over evils."
Alberic I, Count of Dammartin
Alberic( Aubry) de Mello( d. after 1162), Count of Dammartin, based on his marriage to Adela, daughter of Hugh I, Count of Dammartin.
It is believed that Aubry was the son of Gilbert de Mello and Richilde de Clermont, daughter of Hugh, Count of Clermont- en- Beauvais,( d. 1101) and Margaret, daughter of Hilduin IV, Count of Roucy
Hilduin III, Count of Montdidier
Hilduin III (died after 1032), Count of Montdidier, Seigneur de Ramerupt, son of Hilduin II, Count of Arcis-sur-Aube.
He was a member of the House of Montdidier.
Virtually nothing is known about his life.
Hilduin married a wife of unknown name, although, when widowed, she apparently married Renaud I, Count of Soissons as her second husband.
Hilduin and his wife had three children:
Upon his death, Hilduin III was succeeded by his son Hilduin IV as Count of Montdidier.
Hilduin I, Count of Montdidier
Hilduin I( died before 956), Count of Montdidier.
It is unknown who the parents of Hilduin were.
Hilduin was the founder of the House of Montdidier, which produced the Counts of Montdidier, Dammartin and Roucy.
There is considerable confusion as to the immediate family of Hilduin among historians and genealogists because of the lack of documented evidence, the preponderance of the names of Hilduin and Manasses in the family and the existence of other contemporary Hilduins( particularly, the Count of Montreuil).
The only creditable reference to Hilduin I was when Philip I, King of France, donated the village of Bagneux to the Abbey of Saint- Germain- des- Prés in exchange for Combs la Ville by charter dated 1061, which recounts that Hugh the Great had granted Combs to" Hilduino…comiti de Monte qui vocatur Desiderius", who died before his benefactor( before 956), and that Henry I, King of France, had regranted Combs to" Manasses nepos supradicti Hilduini comitis"[ Manasses, grandson of Hilduin] just as" suus avunculus Hilduinus"[ his uncle Hilduin] had held it, noting that" Odo comes filius prefati Manassetis"[ Odo, son of Manasses] now claimed the property.
Historians disagree as to the exact disposition of the descendants, but all agree that they descended from Hersende, Dame of Ramerupt, who was married to Hilduin I, or his son of the same name, or his brother, or, in some interpretations, his daughter.
We can not resolve these competing claims and will assume that Hilduin was married to Hersende( Heldwide).
In 948, the first church in Montdidier, Somme, was built near the castle of Charlemagne by Hersende.
The count and his wife had two children:
The next known Count of Montdidier was Hilduin III, grandson of Hilduin I.
The apparent gap in the countship is unexplained.
A common mistake is to assume the Hugh I, Count of Ponthieu, husband of Gisele, daughter of Hugh Capet, was the son of Hilduin I, when, in fact, his father was Hilduin( Herluin), Count of Montreuil, as discussed by Flodoard.
Renaud II, Count of Clermont-en-Beauvaisis
Renaud II of Clermont(" Renaud/ Rainald II de Clermont"; 1075 – 1152), son of Hugh I, Count of Clermont- en- Beauvaisis, and Marguerite de Roucy( daughter of Hilduin IV, Count of Montdidier).
Renaud became Count of Clermont- en- Beauvaisis upon his father ’s death in 1101.
Hilduin IV, Count of Montdidier
Hilduin IV (d. 1063), Count of Montdidier and Lord of Ramerupt, son of Hilduin III, Count of Montdidier, member of the House of Montdidier.
Hilduin was also Count of Roucy by virtue of his marriage to the daughter of Ebles
I, Count of Roucy.
Little is known about Hilduin despite his many renowned children and grandchildren.
Hériman of Tournai records that Philip I of France appointed Hilduin as an ambassador to Rome (date unknown).
Sometime between 1033 and 1054, probably closer to the latter, Hilduin was driven from Montdidier by Count Ralph IV of Valois, who continued to rule it until his death in 1074.
Hildiun married Adelaide (Alice) de Roucy, daughter of Ebles
I, Count of Roucy, and Beatrix of Hainaut.
They had nine children:
Hilduin was apparently the last Count of Montdidier, the line being continued with the Counts of Roucy.
Felicia of Roucy
Felicia of Roucy( – 3 May 1123) was a queen consort of Aragon and Navarre.
She was a daughter of Hilduin IV of Montdidier and his wife Alice of Roucy.
She was married in 1076 to Sancho Ramírez, then king of Aragon after he had divorced his first wife, Isabella of Urgell.
His accession to the crown of Navarre later that year made her the first Aragonese consort to also be Queen consort of Navarre.
She is attested shortly before her husband's death and is now thought to have outlived Sancho( the supposed subsequent marriage of Sancho to a third wife, Philippa of Toulouse, appearing in a later chronicle, is now thought to be erroneous).
Felicia gave birth to three sons, Ferdinand, Alfonso and Ramiro, the latter two following her step- son Peter I of Aragon and Navarre in Aragon( Alfonso also in Navarre).
Through Ramiro's only daughter Petronila of Aragon, she was ancestor of the later rulers of Aragon.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Rotrou III, Count of Perche
Rotrou III( bef. 1080 – 8 May 1144), called the Great(" le Grand"), was the Count of Perche and Mortagne from 1099.
He was the son of Geoffrey II, Count of Perche, and Beatrix de Ramerupt, daughter of Hilduin IV, Count of Montdidier.
He was a notable Crusader and a participant in the" Reconquista" in eastern Spain, even ruling the city of Tudela in Navarre from 1123 to 1131.
He is commonly credited with introducing Arabian horses to the Perche, giving rise to the Percheron breed.
By his creation of a monastery at La Trappe in memory of his wife, Matilda, daughter of Henry I of England, in 1122 he also laid the foundations of the later Trappists.

Question: Who is Hilduin Iv, Count Of Montdidier's paternal grandfather?