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.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Michael IX Palaiologos
Michael IX Palaiologos or Palaeologus ("Mikhaēl IX Palaiologos"), (17 April 1277 – 12 October 1320, Thessalonica, reigned as Byzantine co-emperor with full imperial style 1294/1295–1320.
Michael IX was the eldest son of Andronikos II Palaiologos and Anna of Hungary, daughter of Stephen V of Hungary.
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.
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.
Theodora Palaiologina, Empress of Bulgaria
Thodora Palaiologina  was a Byzantine princess who became a Bulgarian empress as wife of the emperors Theodore Svetoslav from 1308 to his death in 1321, and Michael Shishman from 1324 to his fall in the Battle of Velbazhd on 28 July 1330.
She was a daughter of the Byzantine emperor Michael IX Palaiologos (r. 1295–1320), son and co-ruler of Andronikos II Palaiologos (r. 1282–1328), and Rita of Armenia who was a daughter of the ruler of the Armenian Kingdom of Cilicia.
She was a sister of Byzantine emperor Andronikos III Palaiologos (r. 1328–1341).
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.
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.

Question: Who is the paternal grandmother of Theodora Palaiologina, Empress Of Bulgaria?
Answer: Anna of Hungary