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.
Peter August, Duke of Schleswig-Holstein-Sonderburg-Beck
Peter August Friedrich, Duke of Schleswig-Holstein-Sonderburg-Beck (7 December 1697 – 22 March 1775) was a Duke of Schleswig-Holstein-Sonderburg-Beck.
He was the fifth and youngest son of Frederick Louis, Duke of Schleswig-Holstein-Sonderburg-Beck and his wife Duchess Louise Charlotte of Schleswig-Holstein-Sonderburg-Augustenburg.
Born in Königsberg, Brandenburg-Prussia, Peter August became Governor General of Reval (Tallinn), Governor of Estonia, and a Field Marshal in the Russian Imperial Army.
He died in Reval.
He was only the "titular" duke, because he did not inherit the domain of Beck.
It had been inherited by his father's older brother, Duke August (1652–1689), and nephew Frederick William I (1682–1719), and was then sold by the latter's widow to Peter August's older brother, Duke Frederick William II (1687–1749), in 1732.
But he re-sold it in 1745 to Baroness Magdalena von Ledebur-Königsbrück.
Thus, by the time that Peter August became the head of this cadet branch of the Danish royal dynasty, he was "Duke of Schleswig-Holstein-Sonderburg-Beck" in name only.
He is the male line ancestor of Margrethe II of Denmark, Harald V of Norway and Charles, Prince of Wales.
Prince Karl Anton August of Schleswig-Holstein-Sonderburg-Beck
Prince Karl Anton August of Schleswig -Holstein- Sonderburg- Beck( 10 August 1727, in Marburg – 12 September 1759, in Stettin) was the son of Peter August, Duke of Schleswig- Holstein- Sonderburg- Beck and Princess Sophie of Hesse- Philippsthal.
Frederick Louis, Duke of Schleswig-Holstein-Sonderburg-Beck
Frederick Louis of Holstein-Sonderburg-Beck (6 April 1653 – 7 March 1728) was a Duke of Schleswig-Holstein-Sonderburg-Beck and field marshal of the Prussian Army.
He was the son of August Philipp, Duke of Schleswig-Holstein-Sonderburg-Beck and Countess Marie Sibylle of Nassau-Saarbrücken.
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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
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.

Question: Who is Peter August, Duke Of Schleswig-Holstein-Sonderburg-Beck's paternal grandfather?
Answer: August Philipp, Duke of Schleswig-Holstein-Sonderburg-Beck