Question: Eric Christoffersen of Denmark was a member of the dynasty that ruled Denmark during what years?

Documents:
source: House of Estridsen
text: House of Estridsen The House of Estridsen, sometimes called the Estridsen or Estrith Dynasty, was the dynasty that provided the Kings of Denmark from 1047 to 1412. The dynasty is named after its ancestor Estrid Svendsdatter. The dynasty is sometimes called the "Ulfinger", after Estrid's husband, Ulf the Earl.

source: Eric Christoffersen of Denmark
text: Eric Christoffersen of Denmark Eric Christoffersen (c. 1307 – c. 1332) (Danish: "Erik Christoffersen" ) was king of Denmark from 1321 until his death, jointly with his father, King Christopher II. He was a member of the House of Estridsen. In Danish, he is called "Erik, udvalgt Konge."

source: Husainid dynasty
text: Husainid dynasty The Husainid dynasty is the former ruling dynasty of Tunisia originally of Cretan Turkish origin. They came to power under al-Husayn I ibn Ali in 1705 replacing the Muradid dynasty. After taking power the Husainids ruled as Beys, with succession to the throne determined by agnatic seniority with the oldest member of the dynasty becoming Bey. The heir apparent to the Bey held the title Bey al-Mahalla. The Husainids originally ruled under the sovereignty of the Ottoman Empire. In 1881, with the Treaty of Bardo, Tunisia came under the control of France as a protectorate. Following independence from France on 20 March 1956, the Bey Muhammad VIII al-Amin assumed the title of King and reigned as such until the Prime Minister Habib Bourguiba deposed the dynasty and declared Tunisia a republic on 25 July 1957.

source: Eric II of Denmark
text: Eric II of Denmark Eric II the Memorable (Danish: "Erik II Emune" ) ( 1090 – 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.

source: House of Olaf
text: House of Olaf The House of Olaf was a dynasty which ruled Denmark in the late 9th century and early 10th century.

source: Knýtlinga saga
text: Knýtlinga saga Knýtlinga saga ("The Saga of Cnut's Descendants") is an Icelandic kings' saga written in the 1250s, which deals with the kings who ruled Denmark since the early 10th century.

source: Bakenranef
text: Bakenranef Bakenranef, known by the ancient Greeks as Bocchoris, was briefly a king of the Twenty-fourth dynasty of Egypt. Based at Sais in the western Delta, he ruled Lower Egypt from c. 725 to 720 BC. Though the Ptolemaic period Egyptian historian Manetho considers him the sole member of the Twenty-fourth dynasty, modern scholars include his father Tefnakht in that dynasty. Although Sextus Julius Africanus quotes Manetho as stating that "Bocchoris" ruled for six years, some modern scholars again differ and assign him a shorter reign of only five years, based on evidence from an Apis Bull burial stela. It establishes that Bakenranef's reign ended only at the start of his 6th regnal year which, under the Egyptian dating system, means he had a reign of 5 full years. Bakenranef's prenomen or royal name, "Wahkare", means "Constant is the Spirit of Re" in Egyptian.

source: Shang dynasty
text: Shang dynasty The Shang dynasty () or Yin dynasty (), according to traditional historiography, ruled in the Yellow River valley in the second millennium BC, succeeding the Xia dynasty and followed by the Zhou dynasty. The classic account of the Shang comes from texts such as the "Book of Documents", "Bamboo Annals" and "Records of the Grand Historian". According to the traditional chronology based on calculations made approximately 2,000 years ago by Liu Xin, the Shang ruled from 1766 to 1122 BC, but according to the chronology based upon the "current text" of "Bamboo Annals", they ruled from 1556 to 1046 BC. The Xia–Shang–Zhou Chronology Project dated them from c. 1600 to 1046 BC.

source: Estrid Svendsdatter
text: Estrid Svendsdatter Estrid Svendsdatter of Denmark ("Estrith", "Astrith": 990/997 – 1057/1073), was a Danish princess and titular Queen, a Russian princess and, possibly, Duchess of Normandy by marriage. She was the daughter of Sweyn Forkbeard and perhaps Gunhild of Wenden and sister of Cnut the Great. By Ulf Jarl, she was the mother of the later King Sweyn II Estridson and Beorn Estrithson. The dynasty that ruled Denmark in 1047–1412 was named after her. She was known in Denmark as "Dronning Estrid", (Queen Estrid), despite the fact that she was not married to a King and not a queen regnant.

source: Albert IV, Duke of Saxe-Lauenburg
text: Albert IV, Duke of Saxe-Lauenburg Albert IV of Saxe-Lauenburg (1315 – 1343) was the eldest son of John II of Saxe-Lauenburg and Elisabeth of Holstein-Rendsburg (*ca. 1300–before 1340*), sister of Gerard III "the Great". In 1321 Albert IV succeeded his father as Duke of Saxe-Bergedorf-Mölln, a branch duchy of Saxe-Lauenburg, while his mother served as regent, before she remarried Eric Christoffersen (*1307–1331*), a son of King Christopher II and co-ruler in Denmark.

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Answer: 1047 to 1412