Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Máel Sechlain Mac Áeda
Máel Sechlain Mac Áeda was the Archbishop of Tuam 1312 – 10 August 1348.
Áed Findliath
Áed mac Neíll (died 879), called Áed Findliath ("fair-grey Áed"; Modern Irish: "Aodh Fionnadhliath") to distinguish him from his paternal grandfather Áed Oirdnide, was king of Ailech and High King of Ireland.
A member of the northern Uí Néill kindred of the Cenél nEógain
, Áed was the son of Niall Caille.
Domnall mac Áeda
Domnall mac Áeda (died 915), also known as Domnall Dabaill, was a King of Ailech.
He was a son of Áed Findliath mac Néill, High King of Ireland.
Domnall was a half-brother of Niall Glúndub mac Áeda, a man with whom he shared the kingship of Ailech.
Domnall mac Áeda Muindeirg
Domnall mac Áeda Muindeirg( died 804) was a chief of the Cenél Conaill of the northern Uí Néill in modern County Donegal and sometimes styled" King of the North".
He was the son of Áed Muinderg( died 747) and grandson of the high king Flaithbertach mac Loingsig( died 765).
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.
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.
Niall Caille
Niall mac Áeda( died 846), called Niall Caille( Niall of the Callan) to distinguish him from his grandson Niall mac Áeda( died 917), was High King of Ireland.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).

Question: Who is Domnall Mac Áeda's paternal grandfather?
Answer: Niall Caille