ἐφ᾽ οἷς τὴν εἰρήνην ἐποιησάμεθα
op welke voorwaarden wij de vrede gesloten hebben
The preposition ἐπί with the dative signals a condition.
‘on condition that’, ‘provided that’
ἀφίεμέν σε ἐπὶ τούτοις, ὅπως μηκέτι διαλέξῃ τούτους τοὺς λόγους οὓς μέχρι νῦν διελέγου
We are acquitting you on the condition that you no longer discourse in the way in which you have discoursed until now.
αὐτοί τε τοῖς περὶ τὸν Ἀννίβαν ἔδοσαν πίστεις καὶ παρ’ ἐκείνων ἔλαβον ἐπὶ τούτοις, ἐφ’ ᾧ Ταραντίνους ἐλευθερώσειν καὶ μήτε φόρους πράξεσθαι κατὰ μηδένα τρόπον
They gave pledges of fidelity to the associates of Hannibal and received pledges from them on the following conditions: that he was to free the Tarentines and that they were not to exact tribute in any way.