The Bagler Sagas (Old Norse Böglunga sögur) are kings' sagas relating to events in Norway from 1202 to 1217. They are our main source to events in Norway in this period. There are two versions, one shorter and one longer, which are in modern editions usually printed as one saga. The sagas deal with the reigns of the birkebeiner kings Haakon Sverresson, Guttorm Sigurdsson and Inge Baardsson, and the bagler kings Erling Steinvegg and Philippus Simonsson. The authors of both versions are unknown. There are indications that both of them were Icelanders, although this cannot be said for certain.