Diana Guardato
Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan Carlos
I of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others.
Anne Denman
Anne Denman( 1587–1661) was born in Olde Hall, Retford, Nottinghamshire.
Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
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.
Thierry, Count of Flanders
Theoderic (– 17 January 1168), commonly known as Thierry of Alsace, was the fifteenth count of Flanders from 1128 to 1168.
He was the youngest son of Duke Theoderic II of Lorraine and Gertrude of Flanders (daughter of Robert I of Flanders).
With a record of four campaigns in the Levant and Africa (including participation in the Second Crusade, the failed 1157–1158 siege of the Syrian city Shaizar, and the 1164 invasion of Egypt), he had a rare and distinguished record of commitment to crusading.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Mona Hopton Bell
Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.
She was the grandmother of the painter Jean H. Bell.
Purnima (Hindi actress)
Purnima Das Verma( born Meherbhano Mohammad Ali) was an Indian film actress who worked predominantly in Hindi language films.
She is the grandmother of actor Emraan Hashmi.
Kaoru Hatoyama
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.

Question: Who is the paternal grandmother of Matthew, Count Of Boulogne?
Answer: Gertrude of Flanders