Drogo of Champagne
Drogo (c.675 – 708) was a Frankish nobleman, the eldest son of Pippin of Heristal and Plectrudis.
He was the duke of Champagne from the early 690s.
Drogo was born shortly after his parents' marriage, which probably took place in 675 or just after.
In the early 680s, Pippin arranged the marriage of Drogo with Anstrudis (or Adaltrudis), the daughter of Waratto, the mayor of the palace in Neustria, and his wife Ansfledis.
The marriage took place toward the end of the decade or in the early 690s.
Drogo and Anstrudis had four sons: Arnulf, who succeeded him as duke of Champagne; Hugh, who entered the church and rose to become an archbishop; Gotfrid; and Pippin;
The marriage of Drogo and Anstrudis increased his father Pippin's influence in Neustria.
Waratto's family properties were located mainly in the vicinity of Rouen.
Drogo, however, was made duke in Champagne, a frontier region between Neustria and Austrasia.
His power in Champagne was enhanced through his control of the monastery of Montier-en-Der and possibly the monastery of Hautvillers.
The "Liber Historiae Francorum", a history of the Franks written in Neustria in 727, portrays the Austrasian Drogo as sympathetic to the Neustrians because of his marital connections.
He did, however, fall foul of the abbey of Saint-Denis, which sued him in the king's court in a property dispute.
King Childebert III ruled in Saint-Denis's favour.
Drogo also lost a lawsuit over the villa of Noisy-sur-Oise with the monastery of Tussonval in 697.
Drogo predeceased his father, dying in 707, according to the "Gesta abbatum Fontanellensium", or in 708, according to most of the annals.
He was buried in the church of Saint Arnulf at Metz, to which his four sons made a grant of land in his honour in June 715.
The "Annales Mettenses" record that Grimoald succeeded Drogo in all his offices, but in fact his son Arnulf succeeded him as duke.
The death of Drogo was perceived by later generations as a pivotal event in the history of the Carolingian dynasty.
Several of the imperial annals written in the late eighth century begin their year-by-year accounts with 708.
These include the "Annales AlamanniciAnnales Nazariani" and "Annales Laureshamenses".
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Scholastique of Champagne
Scholastique of Champagne( 1172–1219) was the daughter of Marie, Countess of Champagne and Henry I, Count of Champagne.
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Hugh of Champagne
Saint Hugh, Hugh of Champagne, or St Hugh of Rouen( died 730), was the grandson of Pepin of Heristal and Plectrude through their son, Drogo of Champagne, and his wife Anstrude, herself the daughter of Waratton and Ansflede.
Both Waratton and Drogo were mayors of the palaces.
Plectrude
Plectrude  (died 718) was the consort of Pepin of Herstal, the mayor of the palace and duke of the Franks, from about 670.
She was the daughter of Hugobert, seneschal of Clovis IV, and Irmina of Oeren.
She was the regent of Neustria during the minority of her grandson Theudoald from 714 until 718.
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Blanche of Navarre, Duchess of Brittany
Blanche of Navarre( 1226 – 12 August 1283), also known as Blanche of Champagne, was the daughter of Theobald the Troubador, King of Navarre and Count of Champagne, and his second wife Agnes of Beaujeu.
She was a member of the House of Champagne.
By her marriage to John I, Duke of Brittany, she became Duchess consort of Brittany.

Question: Who is Drogo Of Champagne's maternal grandfather?
Answer: Hugobert