Lines 12–33 of Book 1 introduce Juno's motivation — her anger at the Trojans, her love of Carthage, and the Judgment of Paris. These lines are dense with subordinate clauses, mythological allusion, and ablative constructions.
Urbs antiqua fuit, Tyrii tenuere coloni, Karthago, Italiam contra Tiberinaque longe ostia…
Citation: Verg. Aen. 1.12–33.
There was an ancient city — Carthage — held by Tyrian settlers, opposite Italy and far from the mouth of the Tiber…
Key vocabulary: antiquus (ancient, old); colonus (settler, colonist); ostium (mouth (of a river), entrance); memor (mindful, remembering).
Grammar focus for this passage: Causal and relative clause chains; Ablative of cause and ablative absolute; Mythological allusion and indirect reference; Key vocabulary: saevus, memor, iudicium, genus, arceo; Periodic sentence structure in verse.
How does this passage connect to lines 1–11? — The proem states Juno's anger; lines 12–33 explain why — the backstory of her hatred for the Trojans.
What's the 'Judgment of Paris'? — Paris chose Venus over Juno as the most beautiful goddess, earning Juno's lasting enmity toward all Trojans.
Is 'Karthago' in apposition? — Yes — it's in apposition to 'urbs antiqua', a classic Vergilian technique of delayed identification.