Eric III of Denmark
Eric III Lamb( – 27 August 1146) was the King of Denmark from 1137 until 1146.
He was the grandson of Eric I of Denmark and the nephew of Eric II of Denmark, whom he succeeded on the throne.
He abdicated in 1146, as the first and only Danish monarch to do so.
His succession led to a period of civil war between Sweyn III, Canute V, and Valdemar I.
Princess Caroline-Mathilde of Denmark
Princess Caroline- Mathilde of Denmark( 27 April 1912 – 12 December 1995) was a daughter of Prince Harald of Denmark and granddaughter of King Frederick VIII of Denmark.
As the wife of Knud, Hereditary Prince of Denmark, she became Hereditary Princess of Denmark.
Jutta of Denmark
Jutta of Denmark also known as" Judith"( 1246-1286/95) was a daughter of Eric IV of Denmark and his wife Jutta of Saxony.
She was a younger sister of Queen Sophia of Sweden, and Queen Ingeborg of Norway, as well as an older sister of Agnes.
Jutta was also mistress for a brief period of time to her brother- in- law Valdemar, King of Sweden.
Jutta was a member of the House of Estridsen.
Eric IV, Duke of Saxe-Lauenburg
Eric IV of Saxe- Lauenburg( 1354 – 21 June 1411 or 1412) was a son of Eric II, Duke of Saxe- Lauenburg and Agnes of Holstein.
Berengaria of Portugal
Berengaria of Portugal (c. 1198 – 27 March 1221) was a Portuguese "infanta" (princess) and Queen of Denmark, by marriage to King Valdemar II.
She was the fifth daughter of King Sancho I of Portugal and Dulce of Aragon.
She was the mother of Danish kings Eric IV, Abel and Christopher I.
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.
Eric II, Duke of Pomerania
Eric II or Erich II( between 1418 and 1425 – 5 July 1474) was a member of the House of Pomerania( also known as the House of Griffins) and was the ruling Duke of Pomerania- Wolgast from 1457 to 1474.
He was the son of Wartislaw IX of Pomerania- Wolgast and Sophia, daughter of Eric IV of Saxe- Lauenburg.
John IV, Duke of Saxe-Lauenburg
John IV of Saxe- Lauenburg( *?– 1414*) was a son of Duke Eric IV of Saxe- Lauenburg and Sophia of Brunswick- Lüneburg.
Eric IV of Denmark
Eric IV, also known as Eric Ploughpenny or Eric Plowpenny , (– 10 August 1250) was king of Denmark from 1241 until his death in 1250.
He was the son of Valdemar II of Denmark by his wife, Berengaria of Portugal, and brother of King Abel of Denmark and King Christopher I of Denmark
Agnes of Denmark
Agnes of Denmark( 1249 – after 1290) was the youngest daughter of Eric IV of Denmark and his wife Jutta of Saxony.
She was the official founder of the St. Agnes' Priory, Roskilde, becoming prioress there.

Question: Who is Eric Iv Of Denmark's maternal grandfather?