Cicero to Atticus, written from the Tusculan villa between 3 and 6 July 44 BC — Perseus dateline Scr. in Tusculano inter v et prid. Non. Quint. a. 710 (44). Bound by the manuscript transmission into the close of book 16, but chronologically much earlier than its neighbours: it dates from the first days of July, around the time of 16.1–16.3, not from the late-autumn Arpinate retreat.

What Perseus transmits is only the brief covering-note: Cicero acknowledges Atticus’s letter, reports that he has written and dispatched a letter to Plancus (enclosing the copy), and promises to learn from Tiro himself what Tiro and his correspondent discussed. The standard modern editions (Shackleton Bailey, Tyrrell–Purser) attach to this cover-note a suite of subsidiary letters, 16.16A–E, which are the texts Cicero forwarded with it — the letter to Plancus, and others. Those subsidiary letters are not in the Perseus TEI text and so are not included in this volume; what stands here is the cover-note as Perseus transmits it.