Grimm took "Forseti", ""praeses"", to be the older form of the name, first postulating an unattested Old High German equivalent *"forasizo" (cf. modern German "Vorsitzender" "one who presides"). but later preferring a derivation from "fors", a "whirling stream" or "cataract", connected to the spring and the god's veneration by seagoing peoples. It is plausible that "Fosite" is the older name and "Forseti" a folk etymology. According to the German philologist, Hans Kuhn, the Germanic form Fosite is linguistically identical to Greek "Poseidon", hence the original name must have been introduced before the Proto-Germanic sound change, probably via Greek sailors purchasing amber. The Greek traveller Pytheas of Massalia, who describes the amber trade, is known to have visited the region around 325 BC.