Siegfried de Guînes (died c. 965) (Latin: Sifridus Dacus), also known as Siegfried "the Dane" (Sifridus de Dachia), Sigifrid, or Sigifroy,[1] is believed to have been a Viking who controlled the area around Guînes in 928, although he never seemed to be formally designated as Count even though he is known as such.
In 877, Charles the Bald had confirmed the abbey's possessions of these lands, which were afterwards obtained by the County of Flanders.
There are two hypotheses regarding how Siegfried came to and took possession of Guînes: There is also a legend that around 965 Siegfried fell in love with Elftrude, daughter of Arnulf I, Count of Flanders, and Elftrude became pregnant.
That same year, Siegfried died and Elftrude had a posthumous son, baptised as Ardolf (Ardolph), who became the first Count of Guînes.
[2][5] Lambert's writings are questionable because he appears to be a chronicler “who makes mistakes, distorts, invents if necessary”.