Karl Jónsson was abbot of the Thingeyrar monastery (Icelandic: Þingeyrarklaustur) dating from 1169 until 1181.
The Saga became a primary source of information concerning the reign of King Sverre.
The work additionally contains relevant facts for this period in the history of Norway.
[1][2] The Benedictine monastery of Thingeyrar was founded in 1133 by Jón Ögmundsson, Bishop of Hólar.
The Thingeyrar Monastery was located in Austur-Húnavatnssýsla, (eastern part of Húnavatnssýslur), in Northwestern Iceland.