Euphrosyne of Polotsk
Saint Euphrosyne of Polotsk( or Polatsk, Połack)( 1104 – 1167) was the granddaughter of a prince of Polotsk, Vseslav, and daughter of Prince Svyatoslav of Polotsk.
She has long been a popular Saint among Orthodox devotees, particularly those in Russia, Ukraine, and Belarus, with a traditional feast day of May 23.
In addition, since 1984, she has been one of the 15 patron saints of Belarus, whose lives are celebrated in the Belarusian Orthodox Church, on the first Sunday after Pentecost.
Rogneda of Polotsk
Rogneda of Polotsk (962–1002) is the Slavic name for Ragnhild, a Princess consort of Rus'.
She was the daughter of Ragnvald (Slavic: Rogvolod) who came from Scandinavia and established himself at Polatsk in the mid-10th century.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Justynian Szczytt (d. 1677)
Justynian Niemirowicz Szczytt( also spelled Szczyt and Szczyth; died 1677) was a Polish nobleman(" szlachcic"), a chamberlain(" podkomorzy") of Polotsk and a deputy to the" sejm"( parliament) of the Polish – Lithuanian Commonwealth.
For many years he was a servant of the magnate Sapieha family.
He was vice" wojewoda"( vice governor) of Polotsk( probably 1666- 70) and chamberlain(" podkomorzy") of Polotsk from 1673.
Szczytt was a" sejm" deputy in 1667, 1668, 1669, 1670 and 1674.
He was also a founder of the Franciscan cloister at Prozaroki( Polish" Prozoroki").
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.
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.
Izyaslav of Polotsk
Izyaslav  was the son of Vladimir I of Kiev and Rogneda of Polotsk.
Following Norse tradition, Izyaslav was sent with his mother to rule her homeland.
There is also a legend that Rogneda tried to get Izyaslav to slay his father.
Despite possibly going against the will of his father, Izyaslav was able to continue his rule in Polotsk.
He was first to make Polotsk autonomous from the Grand Duke of Kiev passing his title to his descendants after his death.
His principality carried a wide degree of autonomy that later was passed and to his descendants as well.
His glory was commemorated after an established city that was named after him.
Izyaslav died at the young age of about 23, in 1001, surviving his mother but predeceasing his father Vladimir of Kiev, thus excluding his descendants from ever succeeding the Kievan throne, according to the so-called "Rota system".
The name of Izyaslav's spouse is unknown.
He had two sons: Bryachislav of Polotsk and Vseslav.
Both were certainly minor at the time of his father's death.
Vseslav died, still in childhood, in 1003, while Bryachislav survived to continue the Polotsk dynasty and to challenge the authority of his uncle Yaroslav the Wise.
His direct progeny ruled Polotsk until 1222.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Bryachislav of Polotsk
Bryachislav Izyaslavich( c. 997 – 1044) was the prince of Polotsk between 1001 and 1044.
His name, possibly, may have been of something in approximation to Vratislav or Wroclaw.
He was son of Izyaslav Vladimirovich.
During his reign Polotsk was at war with Kiev and Novgorod.
In 1015 he has inherited the city of Lutsk after the death of his grandfather Vladimir I of Kiev.
Bryachislav Izyaslavich was born in Polotsk.
Either upon his father's death in 1001 or his minor brother Vseslav's in 1003, he inherited the Principality of Polotsk, himself being a child at this time( his grandparents married about 978).
Under his rule, Polotsk attempted to distance itself from Kiev.
Tensions were exacerbated by the fact that, under the East Slavic house law, since Izyaslav predeceased his father and never reigned in Kiev, his descendants from the House of Polotsk forfeited their dynastic rights to the Kievan throne being classified as izgoi( outcast).
In 1020 Bryachislav managed to sack Novgorod, but on his way back he was confronted by an army of his uncle, Yaroslav the Wise.
Bryachislav suffered a defeat during the battle on the Sudoma River and fled, leaving behind his Novgorodian prisoners and loot.
Yaroslav chased him down and forced him to sign a peace agreement in 1021, granting him only two cities of Usvyat and Vitebsk.
Despite this peace agreement, the hostilities between Bryachislav and Yaroslav continued for years.
Eventually he extended the territory of his principality and established the city of Braslaw.
The name of his spouse or consort is unknown and he had at least one son, Vseslav of Polotsk, who was the ancestor of all the following Polotsk princes and the only one of them to rule in Kiev.
Bryachislav died in Polatsk in 1044.

Question: Who is the maternal grandfather of Izyaslav Of Polotsk?
Answer: Rogvolod