Eric VI of Denmark
Eric VI "Menved" (1274 – 13 November 1319) was King of Denmark (1286–1319).
A son of Eric V of Denmark and Agnes of Brandenburg, he became king in 1286 at age 12, when his father was murdered on 22 November by unknown assailants.
On account of his age, his mother ruled for him until 1294.
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.
Sophie Magdalene of Brandenburg-Kulmbach
Sophie Magdalene of Brandenburg- Kulmbach( 28 November 1700 – 27 May 1770) was queen- consort of Denmark and Norway by marriage to King Christian VI of Denmark and Norway.
Francis of Denmark
Francis of Denmark( 15 July 1497 – 1 April 1511), was a prince of Denmark, Norway and Sweden, the youngest son of King John of Denmark and Christina of Saxony.
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.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
Princess Louise of Denmark (1750–1831)
Princess Louise of Denmark and Norway( 20 January 1750 – 12 January 1831) was born to Frederick V of Denmark and Louise of Great Britain.
Her eldest daughter, Marie of Hesse- Kassel, was the wife of Frederick VI of Denmark.
Ingeborg Magnusdotter of Sweden
Ingeborg Magnusdotter of Sweden( born 1277, Sweden – d. 5 April or 15 August 1319) was Queen of Denmark by marriage to King Eric VI.
She was the daughter of King Magnus III of Sweden and Helwig of Holstein.
Agnes of Brandenburg
"Not to be confused with Agnes of Babenberg"
Agnes of Brandenburg (c. 1257 – 29 September 1304) was a Danish Queen consort by marriage to King Eric V of Denmark.
As a widow, she served as the regent of Denmark for her son, King Eric VI, during his minority from 1286 until 1293.

Question: When did Eric Vi Of Denmark's mother die?
Answer: 29 September 1304