Ablative of Place from Which
When Vergil writes Trōiae quī prīmus ab ōrīs Ītaliam … vēnit — "the man who first came from the shores of Troy" — ab ōrīs names the place from which. The ablative answers whence? — where motion starts.
Learnings0 core · 1 AP claim
AP framework claims (1)— verbatim from AP CED
"from X", "out of X", "down from X" — answers whence?
Geography decides the form. Town/small-island names drop the preposition; everything else keeps it.
See It In Action
— Verg. Aen. i. 1–2
Vergil opens with the canonical ab + ablative for place from which — ab ōrīs, "from the shores." ōrae is a common noun (region / coast), so the preposition is required. If Aeneas had set out from a city — Trōiā profectus — Latin would drop the ab per §427.
— common Caesar / Cicero idiom
The §427 rule in action. Names of cities (Rōmā, Athēnīs, Carthāgine) drop the preposition for place from which. Pair this with the corresponding place-to-which (Rōmam — accusative, no preposition) and place-where (Rōmae — locative) and you have the city-name triplet that's so common in Caesar.
Close cousins — both use ab / ex / dē + abl. (or bare abl. for city names). The difference is concrete vs. abstract motion.
physical motion: the noun names a location you move out of
ex urbe profectus est
"he set out from the city"
figurative removal: the noun names something you're deprived of, freed from, or lacking
metū līberātī sumus
"we have been freed from fear"
Tip: Ask: is the ablative a place (geography, building, region)? Then it's place from which. Is it an abstraction (fear, danger, debt) or thing (eyes, kingdom)? Then it's separation. The form converges; the content separates them.
Why does Caesar write Rōmā profectus without a preposition, but ab ōrīs with ab?
Study Tips
- •Default rule: place from which is ablative + ab / dē / ex. ab = away from, dē = down from, ex = out from.
- •Names of towns and small islands drop the preposition: Rōmā profectus "having set out from Rome"; Athēnīs "from Athens". Same rule applies to domō ("from home") and rūre ("from the country").
- •urbs, oppidum, īnsula always need a preposition. Even when paired with a town name, ex urbe Rōmā "out of the city of Rome."
- •Place from which often blends with the ablative of source (origin / material). Both use ab / ex / dē + abl; context decides whether the start-point is geographic or origin-of-something.