It was at this time that Virgil addressed 'the famous fourth eclogue to him.
The fourth is based on Mantuan's eclogue, De consuetudine divitum erga poetas, with large additions.
Even Virgil in his fourth Eclogue seems to have used Jewish rather than purely heathen oracles.
The chief objection to this view is based upon two lines in the 9th eclogue of Virgil, supposed to have been written 41 or 40 B.C. Here reference is made to a certain Cinna, a poet of such importance that Virgil deprecates comparison with him; it is argued that the manner in which this Cinna, who could hardly have been any one but Helvius Cinna, is spoken of implies that he was then alive; if so, he could not have been killed in 44.
The eighth eclogue of Virgil was addressed to Pollio while engaged in this campaign.