Ziemomysł of Kuyavia
Ziemomysł of Inowrocław (c. 1245 – October/24 December 1287), was a Polish prince member of the House of Piast, Duke of Inowrocław during 1267-1271 and 1278-1287, and ruler over Bydgoszcz during 1267-1269 and 1278-1287.
He was the second son of Casimir I of Kuyavia and his second wife Constance, daughter of Henry II the Pious.
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.
Wenceslaus II, Duke of Cieszyn
Wenceslaus II of Cieszyn( b. 1488/96- d. 17 November 1524), was a Duke of Cieszyn since 1518 until his death( as co-ruler of his father).
He was the second son of Casimir II, Duke of Cieszyn, by his wife Johanna, daughter of Wiktoryn of Poděbrady, Duke of Opawa.
Casimir II of Łęczyca
Casimir II of Łęczyca( pl:" Kazimierz II łęczycki"; c. 1261/62 – 10 June 1294), was a Polish prince member of the House of Piast, Duke of Brześć Kujawski during 1267 – 1288, Duke of Dobrzy ń during 1275 – 1288 and Duke of Łęczyca since 1288 until his death.
He was the fourth son of Casimir I of Kuyavia, but the second born from his third marriage with Euphrosyne, daughter of Casimir I of Opole.
He was probably named after both his father and maternal grandfather.
Frederick of Cieszyn
Frederick of Cieszyn( b. 1480/83- d. June 1507), was a Polish prince member of the House of Piast in the Cieszyn branch.
He was the eldest son of Casimir II, Duke of Cieszyn, by his wife Johanna, daughter of Wiktoryn of Poděbrady, Duke of Opawa.
Kazimierz III of Gniewkowo
Kazimierz III of Gniewkowo (ca.
1280/84 –
22 August 1345/13 May 1350), was a Polish prince member of the House of Piast, Duke of Inowrocław during 1287-1314
(under the regency of his mother until 1294 and his brother during 1294-1296), since 1306 vassal of the Kingdom of Poland, Governor of the Duchy of Pomerelia (Gdańsk Pomerania) during 1306-1309 (on behalf of his uncle
Władysław
I the Elbow-high), since 1314 ruler over Gniewkowo (between 1332-1343 deposed by the Teutonic Order).
He was the third and youngest son of Ziemomysł of Inowrocław and Salomea, daughter of Sambor II, Duke of Pomerelia.
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.
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.
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.
Adelaide of Poland
Adelaide of Poland( c. late 1170s/ early 1180s – 8 December 1211), was a Polish princess and member of the Piast dynasty.
She was the daughter of Casimir II the Just, Duke of Sandomierz and High Duke of Poland, by his wife Helena of Znojmo, a Přemyslid princess.
On basis of the inscription of her tombstone at the Dominican Church and Convent of St. James in Sandomierz and two different reports of Jan Długosz, modern historians agreed with the origin and facts from Adelaide's life.
Today existed a dominant view in historiography consistent with her filiation and death date.
According to them, Adelaide was indeed the daughter of Casimir II the Just and died in 1211, but was n't the foundress of the Convent of St. James and only another nun there.
In the 19th century, appeared a theory which states that Adelaide was the daughter of Casimir I of Kuyavia, who entered in the Convent of St. James as a nun and died there in 1291.
This view, accepted by several scholars, has been disputed.
More recent historiography recognized her as the daughter of Casimir II the Just, founder of the Convent, in which was she buried after her death in 1211.

Question: Who is the paternal grandfather of Kazimierz Iii Of Gniewkowo?
Answer: Casimir I of Kuyavia