Note to Arn Þorfdr 11II
[8] þrimr sinnum ‘three times over’: The first two defeats of the Scots were at Deerness (Dýrnes) and Tarbatness (Torfnes). If the prose Context above is authoritative, the third presumably consisted in Þorfinnr’s punitive attack on the Scots after the battle of Torfnes. The normalised þrimr is the form of the dat. of the numeral recorded in the oldest Icel. mss and appropriate to Arnórr’s time. The later þrim developed by analogy with other datives in -m and the variant þremr is due to lowering of original [i] before a nasal (Seip 1955, 153).