Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Francis Otto, Duke of Brunswick-Lüneburg
Francis Otto, Duke of Brunswick- Lüneburg( 1530 – 1559) was the Prince of Lüneburg from 1555 to 1559.
He was the son of Ernest I, Duke of Brunswick- Lüneburg.
Jørgen Ringnis
Jørgen Ringnis, also known as" Jørgen Billedsnider",( birth unknown, died 1652 in Nakskov) was a Danish woodcarver.
He created a number of altarpieces and pulpits in Danish churches, especially on the islands of Lolland and Falster.
Otto, Duke of Lolland and Estonia
Otto of Denmark (c. 1310 – after 1346)  was a Danish prince who was also Duke of Lolland and Estonia.
He was the second son of King Christopher II of Denmark and Euphemia of Pomerania.
In his childhood his older brother Eric had been elected as junior king of Denmark.
Otto was given the titles Duke of Lolland and Estonia and was expected to expand the Danish conquest of Estonia acquired during Livonian Crusade.
His father and brother were deposed in 1326 and restored three years later on the condition his father signed a charter that gave him little to no power while the Danish nobles and the Counts of Holstein ruled behind the scene and mortgaged most of the kingdom.
His brother Eric predeceased both Otto and his father, fighting to rid Denmark from the rule of the Counts of Holstein.
King Christopher died in 1332, leaving Otto and his younger brother Valdemar as his only sons and potential heirs to the throne.
The Danish nobles for some reason decided not to elect a successor.
In 1332, Otto made an attempt to win the Danish crown, but was defeated by Count Gerhard III of Holstein on Taphed at Viborg on 7 October 1334.
He was held prisoner in the Segeberg Castle.
Upon his father's death and his failed attempt to seize the throne, Denmark ceased being a formal kingdom, and for the next eight years it was subjected by various mortgagees to German military rule.
His younger brother would later regain Denmark from the Holsteiners and succeed as Valdemar IV of Denmark.
Once Valdemar became king in 1340, Otto was released on the condition that he surrender his claim to the throne.
Otto subsequently went to Germany, and joined the Teutonic Order in 1346.
The Order bought his duchy in the same year, and no further information is recorded about him.
Otto is the other (?
Translation needed?)
hero of Bernhard Severin Ingemann's novel, "Prins Otto af Danmark og Hans Samtid" (Prince Otto of Denmark and his Time, 1835).
Thomas Howard, 2nd Duke of Norfolk
Thomas Howard, 2nd Duke of Norfolk( 144321 May 1524), styled Earl of Surrey from 1483 to 1485 and again from 1489 to 1514, was an English nobleman and politician.
He was the eldest son of John Howard, 1st Duke of Norfolk, by his first wife, Catharina de Moleyns.
The Duke was the grandfather of both Queen Anne Boleyn and Queen Catherine Howard and the great grandfather of Queen Elizabeth I.
He served four monarchs as a soldier and statesman.
Euphemia of Pomerania
Euphemia of Pomerania (1285 – 26 July 1330) was Queen of Denmark as the spouse of King Christopher II.
She was the daughter of Bogislaw IV, Duke of Pomerania, and his second spouse, Margarete of Rügen.
Euphemia wed Christopher in 1300.
The marriage was likely a politically arranged marriage to provide Christopher with political support from the dynasty of her mother as well as that of her father.
Not much is known about queen Euphemia.
Euphemia had at least six known children:
She is buried in the Sorø Abbey.
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.
Richard Wesley, 1st Baron Mornington
Richard Colley Wesley, 1st Baron Mornington (– 31 January 1758) was an Irish peer, best remembered as the grandfather of Arthur Wellesley, 1st Duke of Wellington.
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 the maternal grandfather of Otto, Duke Of Lolland And Estonia?
Answer: Bogislaw IV, Duke of Pomerania