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.
Maria Laskarina
Maria Laskarina (c. 1206 – 16 July or 24 June 1270) was a Queen consort of Hungary by marriage to Béla IV of Hungary.
She was the daughter of Theodore I Laskaris and Anna Angelina.
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.
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
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Princess Yolanda of Savoy
Princess Yolanda of Savoy (1 June 1901 – 16 October 1986) was the eldest daughter of King Victor Emmanuel III of Italy.
Yolanda of Poland
Yolanda of Poland (also known as Helen; 1235 – 11 June 1298) was the daughter of King Béla IV of Hungary and Maria Laskarina.
She was the sister of Margaret of Hungary and Kinga of Poland (Cunegunda).
One of her paternal aunts was the Franciscan Elizabeth of Hungary.
Margaret of Hungary (saint)
Margaret of Hungary( January 27, 1242 – January 18, 1270) was a Dominican nun and the daughter of King Béla IV of Hungary and Maria Laskarina.
She was the younger sister of Kinga of Poland( Kunegunda) and Yolanda of Poland and, through her father, the niece of the famed Elizabeth of Hungary.

Question: Who is the maternal grandfather of Yolanda Of Poland?
Answer: Theodore I Laskaris