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.
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.
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.
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.
Elena Asenina of Bulgaria
Elena of Bulgaria was an empress consort of Nicaea, married to Theodore II Laskaris (r. 1254–1258).
She was daughter of Bulgarian Emperor Ivan Asen II and Anna Maria of Hungary.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
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.
Maria Asenina of Bulgaria
Maria Asenina of Bulgaria was a Bulgarian princess and empress consort.
She was the consort of Emperor Mitso Asen of Bulgaria( reigned 1256 – 1257).
She was the daughter of Emperor Ivan Asen II of Bulgaria and Empress Irene Komnene of Epirus.
Through her mother, she was a granddaughter of Theodore of Epirus.
She is mother of Bulgarian Emperor Ivan Asen III( r. 1279 – 1280) and of Bulgarian Empress Kira Maria, who married Emperor George I of Bulgaria.
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.

Question: Who is the maternal grandmother of Elena Asenina Of Bulgaria?
Answer: Gertrude of Merania