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.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Barbara of Oleśnica
Barbara of Oleśnica  (1465 – 1479) was a member of the House of Piast and Duchess of Oleśnica during 1475–1478.
She was the only child of Konrad IX the Black, Duke of Oleśnica by his wife Margareta, daughter of Duke Siemowit V of Rawa.
Bolesław of Oleśnica
Bolesław of Oleśnica( c. 1295 – before 23 April 1321), was a Duke of Żagań, Ścinawa, etc., during 1309- 1312( with his brothers as co-rulers), Duke of Oleśnica, Namysłów, Gniezno and Kalisz during 1312- 1313( with his brother as co-ruler), Duke of Gniezno during 1313- 1314( alone) and Duke of Oleśnica since 1313 until his death( alone).
He was the third son of Henry III( I), Duke of Głogów, by his wife Matilda, daughter of Albert I, Duke of Brunswick- Lüneburg.
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.
Konrad IX the Black
Konrad IX the Black (c. 1415 – 14 August 1471) was a duke of Oleśnica, Koźle, half of Bytom and half of Ścinawa since 1450 (with his brothers as co-rulers), and since 1452 sole ruler over Oleśnica, Koźle and half of Bytom.
He was the eldest son of Konrad V Kantner, Duke of Oleśnica by his wife Margareta.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.

Question: Who is the paternal grandfather of Barbara Of Oleśnica?
Answer: Konrad V Kantner