Frederick William, Duke of Courland
Frederick William (19 July 1692 – 21 January 1711) was Duke of Courland and Semigallia from 1698 to 1711.
Frederick Wilhelm was the son of Frederick Casimir Kettler and Elisabeth Sophie of Brandenburg.
During his reign the duchy was occupied by Swedish and later by Russian troops.
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.
Sophia Dorothea of Hanover
Sophia Dorothea of Hanover( – 28 June 1757) was a Queen consort in Prussia as spouse of Frederick William I.
She was the sister of George II, King of Great Britain, and the mother of Frederick II, King of Prussia.
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.
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.
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
Frederick Casimir Kettler
Frederick Casimir Kettler (German: "Friedrich Casimir Kettler"; 6 July 1650 – 22 January 1698) was Duke of Courland and Semigallia from 1682 to 1698.
Frederick Casimir was the son of Jacob Kettler and Louise Charlotte of Brandenburg.
In his reign the Duchy lost its geopolitical position and became Sweden, Prussia and Russia's territorial subject of interests.
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.

Question: Who is the paternal grandfather of Frederick William, Duke Of Courland?
Answer: Jacob Kettler