Κηφισσός
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
English (LSJ)
v. Κηφισός.
Wikipedia EN
Cephissus commonly spelled Kephissos or Kifisos (/ˈkɛfɪˌsəs/ or /ˌkɪfɪˈsoʊs/; Ancient Greek: Κηφισός Kifisós, [kifiˈsos]) is a river god of ancient Greece, associated with the river Cephissus in Attica and/or with the river Cephissus in Boeotia, both in Greece.