Valdemar II of Denmark
There are good reasons to assume that the author was Óláfr Þórðarson (d. 1259), nicknamed "hvítaskáld" "the White Poet", who was a nephew of Snorri Sturluson. Óláfr is also known for having written the "Third Grammatical Treatise". He stayed with the Danish ruler Valdemar II of Denmark in 1240–1241, and Valdemar provided the saga's author with "a great deal of information" and "outstanding accounts".