Claus Krag argued that an important motive was to establish a hereditary claim to Viken, the region around Oslo, because the area had been paying taxes to the King of Denmark.
Krag, Claus Sverre. Norges største middelalderkonge (Aschehoug. Oslo: 2005)
Scholar Claus Krag sees echoes of Judas kissing Jesus in the scenes in Heimskringla between Kálfr and Olaf.
Krag, Claus Sverre – Norges største middelalderkonge (Oslo: H. Aschehoug & Co. 2005) ISBN 82-03-23201-9.
Krag, Claus (2005) Sverre, Norges største middelalderkonge ISBN 82-03-23201-9
Krag, Claus Ynglingatal og Ynglingesaga- en studie i historiske kilder (1991)
Santa Claus | Hugo Claus | Claus Krag | Santa Claus Conquers the Martians | I Saw Mommy Kissing Santa Claus | Yes, Virginia, there is a Santa Claus | Toronto Santa Claus Parade | Krag (surname) | Krag | Fred Claus | Claus Zundel | Claus Christiansen | The Year Without a Santa Claus | Santa Claus Is Coming to Town | Karl Ernst Claus | Emile Claus | Claus Spreckels | Claus Sluter | Claus P. Schnorr | Claus Peter Flor | Claus Luthe | Claus Lauritz Clausen | Claus Kleber | Claus-Frenz Claussen | Vilhelm Krag | The Year Without a Santa Claus (2006 film) | Santa Claus Village | Santa Claus's reindeer | Santa Claus (1959 film) | Prins Claus Conservatorium |