Question: Who is the paternal grandfather of Eric V Of Denmark?

Knowledge 1: Eric V of Denmark
Eric V Klipping (1249 – 22 November 1286) was King of Denmark (1259–1286) and son of King Christopher I of Denmark.From 1259-1266, he ruled under the auspices of his competent mother, Margaret Sambiria (1230-1282).Between 1261 and 1262, the young King Eric was a prisoner in Holstein following a military defeat.Afterwards, he lived in Brandenburg, where he was initially held captive by John I, Margrave of Brandenburg (c. 1213-1266) . [SEP] Knowledge 2: Christopher I of Denmark
Christopher I  (1219 – 29 May 1259) was King of Denmark between 1252 and 1259.He was the son of Valdemar II of Denmark by his second wife, Berengaria of Portugal.He succeeded his brothers Eric IV Plovpenning and Abel of Denmark on the throne.Christopher was elected King upon the death of his older brother Abel in the summer of 1252.He was crowned at Lund Cathedral on Christmas Day 1252.
Knowledge 1: Eric II of Denmark
Eric II the Memorable( – 18 September 1137) was king of Denmark between 1134 and 1137.Eric was an illegitimate son of Eric I of Denmark, who ruled Denmark from 1095 to 1103.Eric the Memorable rebelled against his uncle Niels of Denmark, and was declared king in 1134.He punished his adversaries severely, and rewarded his supporters handsomely.He was killed by a subject in 1137 and was promptly succeeded by his nephew Eric III of Denmark. [SEP] Knowledge 2: Sophie of Pomerania, Duchess of Pomerania
Sophia of Pomerania- Stolp( 1435 – 24 August 1497), was a Duchess of Pomerania by birth, and married to Eric II, Duke of Pomerania.Sophia was the daughter of Bogislaw IX, Duke of Pomerania and Maria of Masovia.In 1446, her father died and was succeeded by his cousin, Eric of Pomerania, former King of Denmark, Norway and Sweden.Sophia became the heir of Eric of Pomerania's private fortune.In 1451, Sophia was married to Eric of Pomerania- Wolgast, making her spouse the heir of Eric of Pomerania's territories, while Sophia remained the heir of Eric of Pomerania's private fortune.At the death of Eric of Pomerania in 1459, Sophia's husband united Pomerania through the inheritance of Pomerania- Stolp and Pomerania- Rügenwalde by his marriage, while Sophia became the sole possessor of the vast fortune brought by Eric of Pomerania from his former kingdoms in Scandinavia, as well as the wealth he had acquired by his piracy activity on Gotland.As Eric refused to allow Sophia any of the political power over the territories he acquired through her, which she felt she was entitled to, the couple separated.Sophia moved to Rügenwalde Castle with her children and her lover, Hans of Maszerski.In 1470, she refused to finance her husband's war with Brandenburg.She was widowed in 1474.According to an old legend, she was to have poisoned her sons Wratislaw and Casimir, but when she tried to the same with her son Bogislaw with a poisoned sandwich, he was warned by his jester.The sandwich was given to a dog, who died, after which Sophia was to have fled to Danzig.
Knowledge 1: Eric V of Denmark
Eric V Klipping (1249 – 22 November 1286) was King of Denmark (1259–1286) and son of King Christopher I of Denmark.From 1259-1266, he ruled under the auspices of his competent mother, Margaret Sambiria (1230-1282).Between 1261 and 1262, the young King Eric was a prisoner in Holstein following a military defeat.Afterwards, he lived in Brandenburg, where he was initially held captive by John I, Margrave of Brandenburg (c. 1213-1266) . [SEP] Knowledge 2: 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.

Answer: Valdemar II of Denmark