fögnuð ‘joy’: This is a m. dat. sg. u-stem, and we should have expected the form fagnaði rather than fögnuð. The dat. form must have been leveled in analogy with the acc. (see ANG §395.3). The 721 reading fagnað ‘joy’ is also possible as a dat. sg. form (see Iversen 1961, no. 70.1, Anm. 1).