Dative Case
The dative is the case of the person something matters to. Its umbrella translation is "to" or "for," and its home use is the indirect object — dō tibi librum, "I give you a book." The thing given is the accusative; the person it goes to is the dative.
From that core the dative spreads in ten directions. It is the agent of obligation (Carthāgō dēlenda est nōbīs), the owner in est mihi liber ("I have a book"), the partner of adjectives like similis and amīcus, the second half of a double dative (hoc tibi dōnō est, "this is a gift for you"), and the case demanded by a long list of intransitive verbs (placēre, parcēre, nocēre, persuādēre, imperāre, crēdere, favēre) that English speakers want to put in the accusative.
That last group is the killer pitfall — Caesarī crēdō is "I trust Caesar," not "to Caesar I…something."
"to / for X" — the person something matters to: indirect object, owner, agent of obligation, partner of adjectives, purpose.
A locked list of intransitive verbs (crēdō, parcō, persuādeō, imperō, faveō, noceō…) takes the dative where English wants an accusative. Memorize the list.
See It In Action
— Cic. Fam. ii. 17
Textbook dative: reddidit takes the accusative of the thing handed over (litterās) and the dative of the person it lands with (mihi). This is the home use, and most datives in any Latin sentence are doing exactly this.
— Caes. B. G. i. 40. 15
The trap: English "trusted the legion" sounds transitive, but Latin cōnfīdō keeps an old intransitive sense ("have confidence IN") and takes the dative. The same goes for crēdō, parcō, persuādeō, imperō, faveō, noceō.
— Cic. Manil. 14
Notice that the agent of est dēfendenda is vōbīs — a bare dative, NOT ā vōbīs. With the gerundive of obligation, the dative does the work that ā / ab + abl. does in ordinary passives.
— Caes. B. G. i. 52
Two datives, two jobs — the double dative. Subsidiō is the dative of purpose ("as / for relief"); nostrīs is the dative of the person ("to our men"). The pattern X dat. + Y dat. + esse / mittere is one of Caesar's signatures.
"to / for X" after a verb of giving, telling, sending
dabis profectō misericordiae quod īrācundiae negāvistī = "you will grant TO mercy what you refused TO wrath"
rephrase as "X HAS Y" — drop the verb "to be"
est mihi domī pater = "I HAVE a father at home" (not "there is to me")
"X must / has to " — flip into active
mihi pūgnandum est = "I MUST FIGHT" (literally "there is fighting-to-be-done by me")
"X serves AS Y to Z" or "X is OF service to Z"
māgnō ūsuī nostrīs fuit = "it was OF GREAT USE to our men"
often a possessive in English — "my," "your" — or the colloquial "for me"
versātur mihi ante oculōs = "it comes before MY eyes" (not "to me before the eyes")
English makes both look transitive ("I trust him" / "I praise him"). Latin sorts them by verb identity, not by meaning.
verb takes the DATIVE — no accusative
Caesarī crēdō
I trust Caesar
verb takes the ACCUSATIVE direct object
Caesarem laudō
I praise Caesar
Tip: Don't translate the action — identify the verb. Memorize the dative list (crēdō, parcō, persuādeō, imperō, faveō, noceō, serviō, resistō, invideō, īgnōscō, pāreō, placeō) and reach for the dative whenever you see one.
In Caesar legiōnī cōnfīdēbat ("Caesar trusted the legion"), what case is legiōnī, and why?
Study Tips
- •Default reading is indirect object — "to / for X" — and it works most of the time. Switch only when the verb already has its accusative or when the dative obviously names an owner, an agent, or a partner of an adjective.
- •Memorize the dative-governing verbs in clusters by meaning: trust/believe (crēdō, fīdō), help/please (faveō, placeō, prōsum), command/obey (imperō, pāreō, oboedīre), spare/pardon (parcō, īgnōscō), envy/threaten (invideō, minor), serve/resist (serviō, resistō), persuade (persuādeō). When you see one, expect a dative — never an accusative.
- •Watch for est mihi — when sum meets a dative, translate "X has Y" rather than "Y is to X." Est mihi pater = "I have a father."
- •When you meet the gerundive plus est (the passive periphrastic), the agent goes in the dative, not ā / ab + ablative: mihi pūgnandum est, "I must fight."