The Vocative is the case of direct address, and may be interspersed with other cases in poetic language.
- Tiberīne pater, tē, sāncte, precor: O father Tiber, to thee, holy one, I pray. (tē is the accusative object)
- Rēs omnis mihi tēcum erit, Hotensī: My whole attention will be devoted to you, Hortensius.
Where a noun is placed in apposition to a vocative with the imperative, it may be apposited in the nominative.
- Audī tū, populus Albānus: hear, though people of Alba.
Where the implied subject is tū or vōs, a vocative adjective may take the place of a vocative noun.
- Quō moritūre ruis: where are you rushing off to die?
- Cēnsōrem trabeāte salūtās: robed, you salute the censor.
The Essential AG: 340a-b