Margaret of Masovia
Margaret of Masovia( before 1358 – 14 May 1388/4 April 1396) was Duchess of Pomerania and Brzeg, by her marriages to Casimir IV, Duke of Pomerania and then to Henryk VIII with a Scar.
She was a member of the House of Piast.
Margaret was a daughter of Siemowit III of Masovia and his wife Euphemia of Opawa.
Her paternal grandparents were Trojden I of Masovia and his wife Maria, daughter of Yuri I of Galicia and Euphemia of Kuyavia.
Bolesław of Kuyavia
Bolesław of Kuyavia( also known as Mieszkowic)( 1159 – 13 September 1195) was a Duke of Kuyavia from 1186 until his death.
He was the eldest child( but third- born son) of Mieszko III the Old, Duke of Greater Poland and High Duke of Poland in 1173, by his second wife Eudoxia, daughter of Grand Prince Iziaslav II of Kiev.
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.
Euphemia of Kuyavia
Euphemia of Kuyavia (c. 1265 – March 18, 1308) was a Kuyavian princess, who was Queen consort of Galicia-Volhynia.
She was the daughter of Casimir I of Kuyavia by his third wife Euphrosyne, daughter of Casimir I of Opole.
Euphemia was sister of Władysław
I the Elbow-high, she was wife of Yuri I of Galicia and mother of Andrew of Galicia and Lev II of Galicia.
The only preserved evidence of Euphemia's existence is from Jan Długosz's Yearbooks, which reported that on March 18, 1308 Euphemia died and that she was the daughter of Prince Casimir and the wife of Yuri I, who died in the same year on April 21, which was also his birthday.
Casimir I of Kuyavia
Casimir I of Kuyavia  (c. 1211 – 14 December 1267), was a Polish prince member of the House of Piast, Duke of Kujawy since 1233, ruler over Ląd during 1239-1261, ruler over Wyszogród since 1242, Duke of Sieradz during 1247-1261, Duke of Łęczyca since 1247 and Duke of Dobrzyń since 1248.
He was the second son of Konrad I of Masovia and his wife Agafia of Rus.
He was probably named after his grandfather, Casimir II the Just.
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.
Constance of Wrocław
Constance of Wrocław( c.1221–27 – 21 or 23 February 1257) was a Princess of Silesia and the Duchess of Kuyavia.
She was a member of the Polish House of Piast and mother of Leszek the Black and Ziemomysł of Kuyavia.
Elizabeth of Kuyavia
Elizabeth of Kuyavia(/ Елизабета; 1315/ 1320 – after 22 August 1345) was a Polish noblewoman of the House of Piast.
She was the only daughter of Duke Kazimierz III of Gniewkowo and his wife, whose name and origins are unknown; her brother, Władysław the White, was later a candidate for the Polish throne.
By 1323, King Charles I of Hungary wanted to increase influence over Stephen II, Ban of Bosnia.
He offered Stephan the hand of Elizabeth, the relative of his own Piast wife Elizabeth.
By marrying Elizabeth of Kuyavia, Stephen received from Charles the lands to the west formerly held by Mladen I Šubić of Bribir and Usora and Soli in the north formerly held by Vladislav, King of Syrmia.
The marriage was celebrated by 1339.
Up to 1339, Stephan was married to an unknown Bulgarian princess.
The only child which can be attributed to Elizabeth of Kuyavia without doubt is Elizabeth of Bosnia, born c. 1340.
Some believe that Catherine of Bosnia, Countess of Cilli, was daughter of Elizabeth of Kuyavia and Stephen II, while others argue that Catherine was daughter of Stephen II's brother Vladislaus and his wife Jelena Šubić.
Elizabeth may have also had a son, Vuk who may have survived infancy but he did not outlive his father so never became Ban of Bosnia.
Vuk may have been the son of one of Stephen's previous two wives.
Stephen outlived Elizabeth.
It is unknown what Elizabeth died of.
Judging by the time, it is possible that she died of Black Death, which was sweeping across Europe during the 14th century.
Banness Elizabeth was buried in Bobovac in a tomb which she shared with her husband, brother- in- law Vladislaus and sister- in- law Jelena.
After Elizabeth of Kuyavia's death, her daughter Elizabeth was fostered by the Hungarian queen dowager Elizabeth and this soon led to Elizabeth's marriage to Louis I of Hungary.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.

Question: Who is Euphemia Of Kuyavia's paternal grandfather?
Answer: Konrad I of Masovia