John Mackay (poet)
John Mackay( 1656–1754), known as( The Blind Piper), was a Scottish Gaelic poet and composer, and the grandfather of William Ross.
Bjaðmunjo Mýrjartaksdóttir
Bjaðmunjo Mýrjartaksdóttir (fl. 1102/1103) was a daughter of a Muirchertach Ua Briain, High King of Ireland.
In 1102 whilst still a child, she was married to Sigurðr, son of Magnús Óláfsson, King of Norway.
At this time, Magnús appears to have been in the process of setting up his son as king over the Earldom of Orkney, the Kingdom of the Isles, and the Kingdom of Dublin.
The marriage temporarily bound Muirchertach and Magnús together as allies before the latter's death the following year.
Sigurðr thereupon repudiated Bjaðmunjo, and left for Scandinavia, where he proceeded to share the Norwegian kingship with his brothers.
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Fred Le Deux
Frederick" Fred" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).
He is the grandfather of Tom Hawkins.
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 Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Muirchertach Ua Briain
Muircheartach Ua Briain (old spelling: Muirchertach Ua Briain) (also known as Murtough O'Brien) (c. 1050 – c. 10 March 1119), son of Toirdelbach Ua Briain and great-grandson of Brian Bóruma, was King of Munster and later self-declared High King of Ireland.
Zhao Shoushan
Zhao Shoushan( 12 November 1894 – 20 June 1965) was a KMT general and later Chinese Communist Party politician.
He is the grandfather of Zhao Leji.

Question: Who is the paternal grandfather of Bjaðmunjo Mýrjartaksdóttir?
Answer: Toirdelbach Ua Briain