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.
Newaya Krestos
Newaya Krestos  ("property of Christ", throne name Sayfa Ar`ed
"sword of terror") was Emperor ("nəgusä nägäst")
(1344–1372) of the Ethiopian Empire, and a member of the Solomonic dynasty.
He was the eldest son of Amda Seyon I.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Tewodros I
Tewodros I(" Theodore," throne name" Son of the Lion") was Emperor of Ethiopia( 1413 – 1414) and a member of the House of Solomon.
He was the son of Dawit I by Queen Seyon Mangasha.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Dawit I
Dawit I (Ge'ez: , "David") was Emperor  (1382 – 6 October 1413) of Ethiopia, and a member of the Solomonic dynasty.
He was the younger son of Newaya Krestos.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
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 Dawit I's paternal grandfather?
Answer: Amda Seyon I