found: Skálholtsbók yngsta. Det arnamagmæanske håndskrift 81 A fol. ... 1910- :v. 1, p. 1 (Sverris saga)
found: LC manual auth. cd.(hdg.: Karl Jónsson, abbot, d. 1213; author of Sverris saga)
found: Einarsson, S. A hist. of Icel. lit., 1957:p. 111 (Abbot Karl Jónsson wrote realistic contemporary history, the first life of a reigning king, Sverris saga; scholars are not agreed whether he himself finished the book after Sverris death (1202), but it seems likely since he lived to 1213)
found: Iceland 874-1974, 1975:p. 81 (In 1185 Karl Jónsson (d. 1213), who had been abbot at Þingeyrar, sailed to Norway and began writing the life of King Sverrir, following the king's account)