Over what time period did the dynasty of which Eric Christoffersen of Denmark was a member provide the Kings of Denmark?
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.
Harald III of Denmark Harald III (Harald the Whetstone, Danish: "Harald Hen" ;  1040 – April 17, 1080) was King of Denmark from 1076 to 1080. Harald III was an illegitimate son of Danish king Sweyn II Estridsson, and contested the crown with some of his brothers. He was a peaceful ruler who initiated a number of reforms. Harald was married to his cousin Margareta Hasbjörnsdatter, but did not leave any heirs, and was succeeded by his brother Canute IV the Saint. Four of his half-brothers were in turn crowned Danish kings.