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.
Emperor Gaozong of Tang
Emperor Gaozong of Tang (21 July 628 – 27 December 683), personal name Li Zhi, was the third emperor of the Tang dynasty in China, ruling from 649 to 683 (although after January 665 power and governance was primarily in the hands of his powerful second wife Empress Wu, later known as Wu Zetian).
Emperor Gaozong was the son of Emperor Taizong and Empress Zhangsun.
Emperor Gaozong was aided in his rule by Empress Wu during the later years of his reign after a series of strokes left him incapacitated.
Emperor Gaozong delegated all matters of state to his Strong wife and after he died in 683, power fell completely into the hands of Empress Wu, who subsequently became the only Empress regnant in Chinese history.
After his death, he was interred at the Qianling Mausoleum along with Wu Zetian.
Historians have generally viewed Emperor Gaozong as a weak ruler, inattentive to the business of the state and leaving such business to his powerful wife Empress Wu.
During the first part of his reign, Tang territorial gains, which started with his father Emperor Taizong, continued, including the conquest of Baekje, Goguryeo, and the Western Turkic Khaganate, but throughout the 670s, much of those gains were lost to the Tibetan Empire, Silla, Khitan, and Balhae.
Further, territory previously conquered that belonged to both the Göktürks and the Western Turkic Khaganate were subjected to repeated rebellions.
Prince Zhanghuai
Li Xian  (29 January 655 – 13 March 684), courtesy name Mingyun , formally Crown Prince Zhanghuai , named Li De  from 672 to 674, was a crown prince of the Chinese Tang Dynasty.
He was the sixth son of Emperor Gaozong, and the second son of his second wife Empress Wu (later known as Wu Zetian).
He was known for writing commentaries for the "Book of Later Han", the official history of the Eastern Han Dynasty.
He became crown prince in 675 after his older brother Li Hong's death (which traditional historians believed to be a poisoning by Empress Wu), but soon fell out of favor with Empress Wu herself.
In 680, Empress Wu had her associates accuse Li Xian of treason, and he was demoted to commoner rank and exiled.
In 684, after Emperor Gaozong's death, Empress Wu, then empress dowager, had her associate Qiu
Shenji (丘神勣) visit Li Xian to force him to commit suicide.
In 706, his younger brother Emperor Zhongzong provided Li Xian with an honorable burial by interring his remains at the Qianling Mausoleum.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
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.
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.
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 paternal grandmother of Prince Zhanghuai?
Answer: Empress Zhangsun