f. the Book of Kings, the history of the kings of Norway, also called Konunga-æfi, originally a work of Ari, and since applied to later recensions of the same work; hér hefr upp Konungabók eptir sögn Ara prests Fróða, inscription to Hkr., Cod. Fris. p. 3; also, Æfi Noregs-konunga, Knytl. S. ch. 1, 21, 100; Bók Noregs-konunga, Fb. i. 152.