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.
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.
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.
Donal IV O'Donovan
Donal IV O'Donovan, (or Anglicized as Daniel O'Donovan) , The O'Donovan, of Clancahill (died 1705), was the son of Donal III O'Donovan, The O'Donovan of Clancahill, and Gyles
(Sheela) O'Shaughnessy, daughter of Elis Lynch and Sir Roger Gilla Duff O'Shaughnessy, The O'Shaughnessy.
O'Donovan was MP for Baltimore, County Cork, Ireland, in James II's Patriot Parliament of 1689, along with his kinsmen Jeremiah O'Donovan, The O'Donovan of Clan Loughlin, and Daniel O'Donovan.
Following the Parliament, Donal was outlawed in 1691.
At the time he was outlawed, he was characterised as a gentleman, of Benlahane, an archaic spelling of Bawnlahan, then the family seat.
Donal's grandson, Daniel, son of Richard, changed the name of the family estate from Bawnlahan to Castle Jane when he married (at age 60)
Jane Becher, who was then 15.
Donal III O'Donovan
Donal III O'Donovan , The O'Donovan of Clancahill, born before 1584, was the son of Helena de Barry and Donal II O'Donovan, The O'Donovan of Clancahill.
From the inauguration of his father in 1584 to the date of his own accession to the chiefship in 1639, the O'Donovan family had risen to become one of the most prominent Gaelic families remaining in all the province of South Munster or Desmond, from a position of semi-obscurity in the mid-16th century, although this was in part due to the misfortunes and sad decline of several once more prominent families, as happens in all ages.
Donal II had also been an aggressive seizer of lands during and especially following the Nine Years' War and his son's inheritance, thought to have been approaching 100,000 acres (or possibly greater considering all septs and territories under his control), was colossal for a Gaelic family of the time.
His father also living to a great age, Donal III is believed to have been in his late 50s or early 60s when he began his career as Lord of Clancahill.
He died in 1660 at the age of 80 or greater.
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.
Guillaume Wittouck
Guillaume Wittouck( 1749- 1829) was a Belgian lawyer and High Magistrate.
He was the Grandfather of industrialist Paul Wittouck.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
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.

Question: Who is the paternal grandfather of Donal Iv O'Donovan?
Answer: Donal II O'Donovan