Annio Saturnino: probably a freedman of T. Annius Milo.
aliquot satisdationes secundum mancipium, some satisfactory evidence with reference to ownership. Cicero was apparently about to sell some property, and advises Atticus to give such proof of the validity of his title as was given in the case of the Mennian estate or the Atilian (as I had better call it).
de Oppio: C. Oppius, Caesar's agent in Rome, belonged to that little group of young men who followed Caesar's cause faithfully. His biography of Caesar probably formed the basis of Plutarch's sketch.
quod DCCC aperuisti, because you have expressed a readiness to pay the 800,000 sesterces. The meaning of aperuisti is, however, doubtful. This debt to Caesar, which was still outstanding in Dec., 50 B.C.
(Att. 7.3. II), was evidently expected to block Cicero's opposition to the triumvirs. The plan accomplished its object; cf. Att. 7.3.11 But you know how much is still due him. Do you think, pray, that I have reason to fear lest some Pompeian may twit me with it, if my opposition to Caesar is rather half-hearted, or lest Caesar may call in the loan, if I oppose him somewhat vigorously? I fancy that, if I ever speak boldly in the senate in behalf of the commonwealth, I fancy, I say, that your Tarshish friend Balbus will meet me at the door and say, Pray let me have a cheque for that money.
vel versura facta, even if a (new) loan has to be made.