FORUM APPII, an ancient post station on the Via Appia, 43 m. S.E. of Rome, founded, no doubt, by the original con structor of the road. Horace mentions it as the usual halt at the end of the first day's journey from Rome. It was the starting point of a canal parallel to the road through the Pomptine Marshes and used instead of it at the time of Strabo and Horace (see APPIA, VIA) . It is mentioned also as a halting place in the account of Paul's journey to Rome (Acts xxviii. 15) . Under Nerva and Trajan the road was repaired ; one inscription records the paving with silex (replacing the former gravelling) of the section from Tripontium, 4 m. N.W., to Forum Appii. A post station was placed here by Pius VI. when the Via Appia was reconstructed.