þriþiunger (OSw) þriþiungr (OGu) þriðjungr (ON) noun

Literally a ‘third’ of something. An administrative/judicial division on different levels in the administrative hierarchy. The division into þriþiungar in Uppland was limited to very few districts (Hafström 1949, 142–43), and might not have existed in Västmanland as Schlyter indicates that the manuscript might have been corrupt in the actual passage (Schlyter s.v. þriþiunger). In GL, DL and HL it is the highest administrative district below land (q.v.). In Norwegian laws it was a district on the highest level in FrL and a district below fylki (q.v.) in BorgL, EidsL, GuL. In Iceland (Grg) a þriðjungr corresponds to the group of men attached to a particular goði (q.v.) at a spring assembly. There were three goðar per spring assembly, thus they were responsible for an ’assembly third’ [cf. Grg tr. I:240].

{þriþiunger} OSw DL Eb, Bb, Rb
OSw HL Mb
assembly third OIce Grg Þsþ 23, 45
riding OGu GL A 31, 41, 42, 45a
third OGu GS Ch. 1, 3
ONorw EidsL 32.7
ONorw GuL Krb, Kvb, Løb, Mhb, Sab
OSw HL Äb, Mb, Jb, Kmb, Blb, Rb
OSw UL passim
OSw VmL passim
three lots OSw HL Kkb, Kgb, Mb, Blb Refs:

KLNM, s.v. treding; Lundberg 1972, 91−92; Peel 2015, 14−15, 248−49, 286 note 1/18; Schlyter s.v. þriþiunger; SL DL, xxi; SL GL, lxxxiv−lxxxvii