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... Pergama rapta feres, donec Troiaeque tibique externum patria contingat...

'Troiaeque tibique': 'Troiae' must be a dative; then again this statement puzzles, since, yes, Aeneas (: tibi) gains a new fatherland, but Troy? Unless we must read for 'Troiae' 'Romae'. Take into consideration, that Helenus here utters a prophecy, words that are dubious and have dubble meanings: Troia then might be uttered as Roma.