Konrad III Rudy
Konrad III the Red
(pl: "
Konrad III Rudy"; 1447/48 – 28 October 1503), was a Polish prince member of the House of Piast in the Masovian branch.
He was a duke of Czersk, Liw, Warsaw, Nur, Łomża, Ciechanów, Różan, Zakroczym and Wyszogród during 1454-1471 jointly with his brothers (under regency until 1462), Duke of Płock, Wizna, Płońsk and Zawkrze during 1462-1471, and after the division of the paternal domains in 1471, sole ruler over Czersk and Liw, over Wyszogród during 1474-1489 and again in 1495, over Zakroczym since 1484, over Nur since 1488 and over Warsaw since 1489.
He was the third son of Bolesław IV of Warsaw and Barbara Olelkovna of Slutsk-Kapy, a Lithuanian princess, (granddaughter of Vladimir Olgerdovich).
The premature death of his two older brothers during 1453-1454 left him as the eldest surviving son of his family.
Konrad IV the Older
Konrad IV the Older( ca. 1384 – 9 August 1447) was a Duke of Oels( Oleśnica), Koźle, half of Bytom and half of Ścinawa during 1412– 1416( with his brothers as co-rulers), since 1416 sole ruler over Kąty( Kanth), Bierutów, Prudnik and Syców and since 1417 Bishop of Wrocław and Duke of Nysa.
He was the eldest son of Konrad III the Old, Duke of Oleśnica, by his wife Judith.
The name of Konrad was also wore by his four younger brothers; they were identified by historians only through letters and regnal numbers.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Konrad III the Old
Konrad III the Old( – 28 December 1412) was a Duke of Oleśnica, Koźle, half of Bytom and half of Ścinawa since 1377( until 1403 with his father as co-ruler).
He was the only son of Konrad II the Gray, Duke of Oleśnica, by his wife Agnes, daughter of Casimir I, Duke of Cieszyn.
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.
Konrad V Kantner
Konrad V Kantner( ca. 1385 – 10 September 1439) was a duke of Oleśnica, Koźle, half of Bytom and half of Ścinawa during 1412 – 1427( with his brothers as co-rulers), since 1427 sole ruler over Oleśnica.
He was the second son of Konrad III the Old, Duke of Oleśnica, by his wife Judith.
Like his one older and three younger brothers, at the baptism he received the name of Konrad, which was characteristic in this branch of the House of Piast.
His nickname of" Kantner" was derived from the town of Kanth( pl:" Kąty Wrocławskie"), who was a property of the Oleśnica dukes since 1379.
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 VI the Dean
Konrad VI the Dean( ca. 1391 – 3 September 1427) was a Duke of Oleśnica, Koźle, half of Bytom and half of Ścinawa since 1416( with his brothers as co-rulers).
He was the third son of Konrad III the Old, Duke of Oleśnica, by his wife Judith.
Like his two older and two younger brothers, at his baptism he received the name of Konrad, which was characteristic in this branch of the House of Piast.
Konrad VIII the Younger
Konrad VIII the Younger( after 1397 – before 5 September 1444), was a Duke of Oleśnica, Koźle, half of Bytom and half of Ścinawa during 1416 – 1427( with his brothers as co-rulers) and sole Duke of half of Ścinawa since 1427 until his death.
He was the fifth and youngest son of Konrad III the Old, Duke of Oleśnica, by his wife Judith.
Like his four older brothers, at the baptism he received the name of Konrad, which was characteristic in this branch of the House of Piast.
Bolesław IV of Warsaw
Bolesław IV of Warsaw (also known as Boleslaus IV of Warsaw, ; – 10 September 1454), was a Polish prince member of the House of Piast in the Masovian branch.
He was Duke of Warsaw during 1429–1454 (under regency until 1436) and sovereign Duke of Podlachia in 1440–1444.
He was the second son of Bolesław Januszowic (in turn second son of Janusz I of Warsaw) and Anna Feodorovna of Ratnie, a Lithuanian princess (granddaughter of Algirdas).

Question: Who is the paternal grandfather of Konrad Iii Rudy?
Answer: Bolesław Januszowic