Easton's Bible Dictionary (1897)
), a town on the road, the “Appian Way,” from Rome to Brundusium. It was 43 miles from Rome. Here Paul was met by some Roman Christians on his way to the capital. It was natural that they should halt here and wait for him, because from this place there were two ways by which travellers might journey to Rome.
Smith's Bible Dictionary (1863)
(market-place of Appius), a well-known station on the Appian Way, the great road which led from Rome to the neighborhood of the Bay of Naples. (Acts 28:15) There is no difficulty in identifying the site with some ruins near Treponti .
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
AP'PII FO'RUM (market-place of Appius), a place on the famous Appian Way, 43 miles south-east of Rome, where the disciples met Paul. Acts 28:15. It was at the end of a canal, and hence filled with taverns and boatmen. Its ruins are still seen near Treponti.