Kaliman I of Bulgaria
Kaliman Asen I, also known as Coloman Asen I or Koloman (1234–August/September 1246) was emperor (or tsar) of Bulgaria from 1241 to 1246.
He was the son of Ivan Asen II of Bulgaria and Anna Maria of Hungary.
He was only seven when he succeeded his father in 1241.
In the following years, the Mongols invaded Bulgaria and imposed a yearly tax on the country.
He may have been poisoned, according to contemporaneous rumors about his death.
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.
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.
Anna Maria of Hungary
Anna Maria of Hungary (1204–1237) was an Empress consort of Bulgaria, daughter of King Andrew II of Hungary and Gertrude of Merania.
She was sister of Saint Elizabeth of Hungary.
In January 1221 she married Tsar Ivan Asen II of Bulgaria as his second wife.
Her father was forced to agree to the marriage to effect his release from Bulgaria, where he had been captured on his return from Crusade in late 1218.
Her dowry included the cities of Beograd and Braničevo.
Anna Maria and Ivan Asen II had several children, including:
She died of the plague in 1237 and was buried at SS.
Forty Martyrs Church in Tarnovo.
Hüma Hatun
Hüma Hatun (1410 ‒ September 1449) was the fourth wife of Ottoman Sultan Murad II and mother of Mehmed II and the grandmother of Bayezid II.
Gülbahar Hatun (wife of Mehmed II)
Gülbahar Hatun( 1432 – 1492) was the consort of Sultan Mehmed II, and mother of Sultan Bayezid II of the Ottoman Empire and the grandmother of Selim I.
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.
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.

Question: Who is the maternal grandmother of Kaliman I Of Bulgaria?
Answer: Gertrude of Merania