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.
Van Amstel (family) The Van Aemstel or Van Amstel dynasty (Dutch: "Heren van Amstel" , also spelled "Heeren van Aemstel" or "Heren van Aemstel") was a major lordly dynasty in the medieval Netherlands, which held the heerlijkheid of Amstelland (the area around the Amstel), which it governed in the name of the bishop of Utrecht and the count of Holland.