RT Journal Article SR Electronic T1 The Role of Customary Law in the Legislative Work of King Magnús lagabætir Hákonarson (1263–1280) JF Scandinavian Studies FD University of Wisconsin Press SP 1 OP 26 DO 10.3368/sca.97.3.1 VO 97 IS 3 A1 Valle, Julián YR 2025 UL https://sca.uwpress.org//content/97/3/1.abstract AB This article explores the process of compilation of the legislation over unintentional harm (ON váðaverk) to show the relationship between the customary laws of Norway and Iceland and its appropriation in the royal legislation of King Magnús Hákonarson. It deals with the complex relationship between the customary laws and the royal legislation, by analyzing how these sources were combined, concepts redefined, and new meanings produced in order to advance in the legal unification of Norway and Iceland. It argues that the customary laws of Iceland, collectively known as Grágás, were a source for the compilation of the Norwegian Landslǫ g, and that the legislation over this issue received sustained attention from the Norwegian crown until its definitive realization in Jónsbók.