Statistics for occurrence #1 of “Sena” in book 2, chapter 19 of Polybius, Histories:
...e the army of the Senones were
cut to pieces, and the rest of the tribe expelled from the county;
into which the Romans sent the first colony which they ever
planted in Gaul—namely, the town of Sena , so
called from the tribe of Gauls which formerly
occupied it. This is the town which I mentioned before as
lying on the coast at the extremity of the plains of the Padus.
...