Procillus
Person
Gallic War 1.19 supplies the first indexed source portrait: “… Therefore, before he attempted any thing, he orders Divitiacus to be summoned to him, and, when the ordinary interpreters had been withdrawn, converses with him through Caius Valerius Procillus, chief of the province of Gaul, an intimate friend of his, in whom he reposed the highest confidence in every thing; at the same time he reminds him of what was said …”
Named form in selected editions; identity established only to the extent of the cited context.
Gallic War 1.19
Caesar
… Therefore, before he attempted any thing, he orders Divitiacus to be summoned to him, and, when the ordinary interpreters had been withdrawn, converses with him through Caius Valerius Procillus, chief of the province of Gaul, an intimate friend of his, in whom he reposed the highest confidence in every thing; at the same time he reminds him of what was said about Dumnorix in the council of the Gauls, when he himself was present, and shows what each had said of him privately in his [Caesar's] own presence; he begs and exhorts him, that, without offense to his feelings, he may either himself pass judgment on him [Dumnorix] after trying the case, or else order the [Aeduan] state to do so.
Gallic War 1.47
Caesar
… It seemed [therefore] most proper to send to him C. Valerius Procillus, the son of C. Valerius Caburus, a young man of the highest courage and accomplishments (whose father had been presented with the freedom of the city by C. Valerius Flaccus), both on account of his fidelity and on account of his knowledge of the Gallic language, which Ariovistus, by long practice, now spoke fluently; and because in his case the Germans would have no motive for committing violence; and [as his colleague] M. Mettius, who had shared the hospitality of Ariovistus. …
Gallic War 1.53
Caesar
… C. Valerius Procillus, as he was being dragged by his guards in the fight, bound with a triple chain, fell into the hands of Caesar himself, as he was pursuing the enemy with his cavalry. …