Δοῦβις

From LSJ

εἰ δὲ τύχῃ τις ἔρδων, μελίφρον' αἰτίαν ῥοαῖσι Μοισᾶν ἐνέβαλε → if someone is successful in his deeds, he casts a cause for sweet thoughts into the streams of the Muses

Source

Spanish (DGE)

-ιος, ὁ
Dubis río del este de la Galia, afluente del Arar, actual Doubs, Str.4.1.11, 3.2, Ptol.Geog.2.10.3, Iul.Ep.26 (p.52).