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.
House of Sverre The House of Sverre (Norwegian: "Sverreætten" ) was a royal house or dynasty which ruled, at various times in history, the Kingdom of Norway, hereunder the kingdom's realms, and the Kingdom of Scotland. The house was founded with King Sverre Sigurdsson. It provided the rulers of Norway from 1184 to 1319.