Note 1 — Chapter LXXVI · FROM THE PEACE OF ANTALKIDAS DOWN TO THE SUBJUGATION OF OLYNTHUS BY SPARTA.
Reading edition
It goes by both names; Xenophon more commonly speaks of ἡ εἰρήνη—Isokrates, of αἱ συνθῆκαι.
Though we say, the peace of Antalkidas, the Greek authors say ἡ ἐπ’ Ἀνταλκίδου εἰρήνη; I do not observe that they ever phrase it with the genitive case Ἀνταλκίδου simply, without a preposition.