Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
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.
Leszek of Inowrocław
Leszek of Inowrocław (pl: "
Leszek inowrocławski"; 1275/76 – after 27 April 1339), was a Polish prince member of the House of Piast, Duke of Inowrocław during 1287-1314
(under the regency of his mother until 1294), Duke of Pomerelia (Gdańsk Pomerania) in 1296, ruler over Wyszogród since 1296, in 1300 paid homage to King Wenceslaus II of Bohemia, in 1303 sold to the Teutonic Order the Michałów Land, during 1303-1312 in captivity in Bohemia, since 1312 vassal of the Kingdom of Poland, during 1314-1320/24 sole ruler over Inowrocław, abdicated.
He was the eldest son of Ziemomysł of Inowrocław and Salome, daughter of Sambor II, Duke of Pomerelia.
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.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
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.
Henry Bryant (naturalist)
Henry Bryant( May 12, 1820 – February 2, 1867) was an American physician and naturalist.
He was the grandfather of Henry Bryant Bigelow.
Ziemomysł of Kuyavia
Ziemomysł of Inowrocław (c. 1245 – October/24 December 1287), was a Polish prince member of the House of Piast, Duke of Inowrocław during 1267-1271 and 1278-1287, and ruler over Bydgoszcz during 1267-1269 and 1278-1287.
He was the second son of Casimir I of Kuyavia and his second wife Constance, daughter of Henry II the Pious.
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 the paternal grandfather of Leszek Of Inowrocław?
Answer: Casimir I of Kuyavia