Doamna Chiajna
Doamna Chiajna (1525–1588) was a Princess consort of Wallachia.
She was married to Mircea the Shepherd.
She was regent in Wallachia in 1559–1575.
She was born as Ana in Poland as the daughter of prince Peter IV Rareș, and married prince Mircea the Shepherd in 1545.
She founded the first school in Romania: Câmpulung in 1552.
After the death of her spouse in 1559, she became regent in Wallachia on behalf of her son Petru cel Tânăr.
She is described as an energetic, intelligent and gifted politician.
In 1575, she was abducted by the Ottomans and deported to Aleppo in Syria.
Last sourced report on 1588 and her resting place
whereabouts remained unclear.
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.
John Rufus
John Rufus( born c. AD 450)( also called John of Beth Rufina) was an anti-Chalcedonian priest of Antioch, a disciple of Peter the Iberian and an ecclesiastical historian who served as the bishop of Maiuma.
He wrote the" Plerophoriae" and" The life of Peter the Iberian", the" Commemoration of the death of Theodosius" John was born in the province of Arabia around 450 AD and studied jurisprudence at the Law School of Beirut.
He was ordained a priest in Antioch around 475 by Peter the Fuller.
Upon the return to power of emperor Zeno and the expulsion of Peter the Fuller in 477, John moved to Palestine where he became a disciple of Peter the Iberian.
Upon
Peter the Iberian's death, the bishopric at his monastery of Maiuma passed on to Theodore of Ascalon whereas the" Plerophoriae' names John Rufus as the bishop of the city.
Grand Duchess Natalia Petrovna of Russia (1718–1725)
Grand Duchess Natalia Petrovna of Russia was the youngest daughter of Peter the Great and his second wife Catherine I.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Peter the Younger
Peter the Younger (Romanian: "Petru cel Tânăr")
(1547 – 19 August 1569) was the Voivode (Prince) of Wallachia between 25 September 1559 and 8 June 1568.
The eldest son of Mircea the Shepherd and Doamna Chiajna, his named "the Young" because, at the moment of crowning, he was only 13.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
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.
Lindsey Hughes
Lindsey Hughes( 4 May 1949 – 26 April 2007) was a British historian who studied seventeenth- and eighteenth- century Russia, especially the reign of Peter the Great.
She wrote biographies of Peter and his predecessor Sophia Alekseyevna, as well as a more general work," Russia in the Age of Peter the Great".
She also wrote prolifically on art history.

Question: Who is Peter The Younger's maternal grandfather?
Answer: Peter IV Rareș