Njǫrðr in Later Traditions
The strongest comparative case is the deity Nerthus described by Tacitus in Germania 40: a fertility figure drawn in a cart through the Germanic countryside, associated with peace and a hidden lake. The name Nerthus is the Latinized feminine counterpart of Proto-Germanic *Nerþuz, the pre-form of Njǫrðr, and most scholars accept a historical connection. Yet Tacitus's Nerthus is an earth-goddess, while Njǫrðr is a male sea-god. The mismatch may reflect regional variation, a shift from chthonic to maritime spheres, or the fusion of two related cults. Romans later identified Njǫrðr with Neptune or with maritime Mercury; in medieval Iceland, Christian learned authors euhemerized him as a king of Vanaheimr. The modern Icelandic name Njörður preserves the same phonological core.


