where did the idea of elves come from
Elf The word elf is found throughout the Germanic languages and seems originally to have meant 'white being'. Reconstructing the early concept of an elf depends largely on texts, written by Christians, in Old and Middle English, medieval German, and Old Norse. These associate elves variously with the gods of Norse mythology, with causing illness, with magic, and with beauty and seduction.
Ethnic group Ethnography begins in classical antiquity; after early authors like Anaximander and Hecataeus of Miletus, Herodotus in ca. 480 BC laid the foundation of both historiography and ethnography of the ancient world. The Greeks at this time did not describe foreign nations but had also developed a concept of their own "ethnicity", which they grouped under the name of Hellenes. Herodotus (8.144.2) gave a famous account of what defined Greek (Hellenic) ethnic identity in his day, enumerating