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.
Count Christian of Rosenborg Count Christian of Rosenborg ("Christian Frederik Franz Knud Harald Carl Oluf Gustav Georg Erik"; 22 October 1942 – 21 May 2013) was a member of the Danish royal family. Born Prince Christian of Denmark, he was high in the line of succession until the constitution was changed in 1953 to allow females to inherit the crown, placing his branch of the dynasty behind that of his cousin Margrethe and her two younger sisters. He later gave up his princely rank and his rights to the throne in order to marry a commoner.