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.
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.
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.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
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 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
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.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.

Question: Who is the maternal grandmother of Eric Iv Of Denmark?
Answer: Dulce of Aragon