d) Dative of Separation. Some verbs of taking away, especially compounds of ab, dē, ex, ad, govern a Dative of the person, less often of the thing; as,—
honōrem dētrāxērunt hominī, they took away the honor from the man;
Caesar rēgī tetrarchiam ēripuit, Caesar took the tetrarchy away from the king;
silicī scintillam excūdit, he struck a spark from the flint.
Dative of Agency.
[189]. The Dative is used to denote agency—
1. Regularly with the Gerundive; as,—
haec nōbīs agenda sunt, these things must be done by us;
mihi eundum est, I must go (lit. it must be gone by me).
a. To avoid ambiguity, ā with the Ablative is sometimes used with the Gerundive; as,—
hostibus ā nōbīs parcendum est, the enemy must be spared by us.
2. Much less frequently with the compound tenses of the passive voice and the perfect passive participle; as,—
disputātiō quae mihi nūper habita est, the discussion which was recently conducted by me.