Iyasu II
Iyasu II or Joshua II (Ge'ez ኢያሱ; 21 October 1723 – 27 June 1755) was "nəgusä nägäst"
(throne name Alem Sagad, Ge'ez ዓለም ሰገድ ʿAläm Sägäd, "to whom the world bows")
(19 September 1730 – 27 June 1755) of Ethiopia, and a member of the Gondar branch of the Solomonic dynasty.
He was the son of Emperor Bakaffa and Empress Mentewab (also known by her Baptismal name of Welete Giyorgis).
The Empress Mentewab played a major role in Iyasu's reign, perhaps against her will.
Shortly after he was proclaimed Emperor, a rival claimant assaulted the Royal Enclosure for eight days, only leaving the capital Gondar when an army of 30,000 from Gojjam appeared.
Although the rebels failed to penetrate its walls, nonetheless much of Gondar was left in ruins.
Instead of taking the title of regent upon the succession of her underage son, Empress Mentewab had herself crowned as co-ruler, becoming the first woman to be crowned in this manner in Ethiopian history.
Empress Mentewab wielded significant authority throughout the reign of her son, and well into the reign of her grandson as well.
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.
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.
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.
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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Iyoas I
Iyoas I or Joas I
(Ge'ez:
ኢዮአስ, throne name Adyam Sagad, Ge'ez: አድያም ሰገድ, "to whom the confines of the earth bow")
(d. 14 May 1769) was "nəgusä nägäst" (27 June 1755 – 7 May 1769) of Ethiopia, and a member of the Solomonic dynasty.
He was the infant son of Iyasu II and Wubit (Welete Bersabe), the daughter of an Oromo chieftain of the Yejju district.
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.

Question: Who is Iyoas I's paternal grandfather?
Answer: Bakaffa