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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.
Marjorie Bruce
Marjorie Bruce or Marjorie de Brus (probably 1296–1316) was the eldest daughter of Robert the Bruce, King of Scots, by his first wife, Isabella of Mar.
Marjorie's marriage to Walter, High Steward of Scotland gave rise to the House of Stewart.
Her son was the first Stewart monarch, King Robert II of Scotland.
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.
Isabella of Mar
Isabella of Mar (fl. c. 1277 – 12 December 1296) was the first wife of Robert Bruce VII, Earl of Carrick.
Isabella died before her husband was crowned (as Robert I) King of Scotland.
She and her husband were the grandparents of Robert II, King of Scotland.
Isabella was the daughter of Domhnall I, Earl of Mar (died 1297×1302) and Elena, daughter of Llywelyn the Great (died 1282).
Isabella's father was evidently an adherent of Robert Bruce V, Lord of Annandale (died 1295), a man who staked a claim to the Scottish throne.
The close relationship between the Domhnall's family and the Bruces is evidenced by two marriages.
One was that between Isabella and Robert Bruce VII, Earl of Carrick (died 1329), a grandson of Robert Bruce V. Domhnall's son and comital successor, Gartnait (died c.1302), married a sister of Robert Bruce VII.
The marriage of Robert Bruce VII and Isabella probably took place in the 1290s.
The union produced a single child, a daughter named Marjorie (died 1316), who was born in about 1296.
Six years after Isabella's death, Robert Bruce VII married his second wife, Elizabeth de Burgh (died 1327).
Robert and Isabella's daughter, Marjorie, married Walter Stewart, Steward of Scotland, and their son eventually reigned as Robert II, King of Scotland (died 1390).
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.
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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.

Question: Who is Marjorie Bruce's maternal grandfather?
Answer: Domhnall I, Earl of Mar