ἀμφίπολις
From LSJ
Ἀναβάντα γὰρ εἰς τὴν ἀκρόπολιν, καὶ διὰ τὴν ὑπερβολὴν τῆς λύπης προσκόψαντα τῷ ζῆν, ἑαυτὸν κατακρημνίσαι → For he ascended the acropolis and then, because he was disgusted with life by reason of his excessive grief, cast himself down the height
English (LSJ)
poet. ἀμφίπτολις, ὁ, ἡ,
A encompassing city, ἀνάγκη ἀμφίπτολις A.Ch.75 (lyr.). II Subst. ἀ., ἡ, city encompassed by a river, as pr. n., Th.4.102, etc.