Ribhus

"In Greece the name rbhu appears as Orpheus, the famous poet and musician from Thrace who gave rise to the Orphic cult and mysteries. The later story about his descent into Hades to recover Eurydice may well be an echo of a rejuvenation attempt, while the shamanist aspect of the myth is maintained. Orpheus’s poetry and music links well with the rbhus’ poetic power in [the Rigveda]. It is therefore very curious that many philologists refuse to see this connection... There is no substantial reason, philological or semantic, why Greek Orpheus and Germanic elf should not be related to Sanskrit rbhu."