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.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
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.
Salomon III
Salomon III or Solomon III was the Emperor of Ethiopia (20 May 1796 – 15 July 1797 and 16 June – 25 July 1799) and a member of the Solomonic dynasty.
He was the son of Tekle Haymanot II.
He may be identical with the Emperor Solomon whom the traveler Henry Salt lists as one of the Emperors still alive at the time of his visit in 1809/1810.
E. A. Wallis Budge notes some authorities believe he was the same person as Baeda Maryam II.
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.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Iyasu IV
Iyasu IV or Joshua IV  was "nəgusä nägäst" (18 June 1830 – 18 March 1832) of Ethiopia, and a member of the Solomonic dynasty.
He was the son of Salomon III.
He was largely a figurehead, set on the throne by the "Enderase" or Regent, Ras Dori, who had deposed Gigar.
However, Iyasu took to riding through the countryside and organizing raids; when Ras Ali II who had succeeded his uncle Ras Dori heard about this, he quickly deposed Iyasu.
However, Samuel Gobat records in his journal that Iyasu's fall was due to efforts of the former Emperor Gigar, who "by false testimony" accused Iyasu of inviting Ras Ali's rival, Ali Faris, to depose the "EnderaseIt is now said" Gobat wrote on 26 November 1832, "that the old king, Guigar, has procured his death by poison."

Question: Who is Iyasu Iv's paternal grandfather?
Answer: Tekle Haymanot II