My view of how the Keltoi (of the Keltiad novels—but merged as part of the Independent Systems of the Firefly ‘verse…), influence the Chiss when the cultures first encounter each other…
“Pompeius Trogus goes a step further and identifies key elements of Greek [Chiss] culture brought by the Massiolites [modern Marseilles]:
“”They [the Gauls] learned to prune the vine and plant the olive; and such a radiance was shed over both men and things, that it was not Greece [the Chiss] which seemed to have immigrated into Gaul [the Keltiad systems], but Gaul [the Keltiad culture] that seemed to have been transplanted into Greece [the Chiss—don’t really know how to interpret Space Kelts—and poor Thrawn—finds their art…enchanting as it is enigmatic and opaque—but their music/poetry, confounding for its absolute wildness and melancholy both…].”
—excerpt from ‘FarEdgesoftheKnownWorld’, by OwenRees…