Stephanos of Byzantium - Ethnika
Darieion: a city in Phrygia. The ethnonym, according to the rule for Phrygian names, is, with one syllable omitted, 'Darieus', as 'Kotiaeus' is from 'Kotiaeion', [or], according to the rule of 'Rhoiteion' and 'Sigeion', 'Darieieus'.
AI translation — gpt-5.6-sol; Gabe v3
Stephanos excerpt (left) is aligned with matched Herodian passages (right). Colors indicate corresponding overlap spans.