Henry Bryant (naturalist)
Henry Bryant( May 12, 1820 – February 2, 1867) was an American physician and naturalist.
He was the grandfather of Henry Bryant Bigelow.
Fujiwara no Nagara
, also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period.
He was the grandfather of Emperor Yōzei.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Prithvipati Shah
Prithvipati Shah( ?–1716) was the king of the Gorkha Kingdom in the Indian subcontinent, present- day Nepal.
He was the grandfather of Nara Bhupal Shah.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Thiệu Trị
Thiệu Trị (lit. "inheritance of prosperity"; 6 June 1807 – 4 November 1847), personal name Nguyễn Phúc Miên Tông or Nguyễn Phúc Tuyền, was the third emperor of the Nguyễn Dynasty.
He was the eldest son of Emperor Minh Mạng, and reigned from 14 February 1841 until his death on 4 November 1847.
Minh Mạng
Minh Mạng (lit. "the bright favour of Heaven"; 25 May 1791 – 20 January 1841; born Nguyễn Phúc Đảm, also known as Nguyễn Phúc Kiểu) was the second emperor of the Nguyễn dynasty of Vietnam, reigning from 14 February 1820 until his death, on 20 January 1841.
He was the fourth son of Emperor Gia Long, whose eldest son, Nguyễn Phúc Cảnh, had died in 1801.
He was well known for his opposition to French involvement in Vietnam and his rigid Confucian orthodoxy.

Question: Who is Thiệu Trị's paternal grandfather?
Answer: Gia Long