Philippi sits on the inland plain of eastern Macedonia, ten miles north of the Aegean port of Neapolis (modern Kavala) and astride the Via Egnatia — the great Roman trunk road running from the Adriatic to Byzantium. Octavian and Antony defeated Brutus and Cassius on this plain in 42 BC; Augustus subsequently refounded the city as Colonia Iulia Augusta Philippensis, settling Roman veterans and granting it the ius Italicum — the privileged legal status of Italian soil. The French School at Athens (École française d'Athènes) has excavated continuously since 1914; the site is a UNESCO World Heritage Site. Acts 16:11–40 names Philippi as the first European city Paul evangelized, around AD 49. Luke's narrative is unusually rich in civic detail. The colony's pride in its Roman status surfaces in the magistrates' charge against Paul and Silas: "these men are disturbing our city; they are Jews, and they advocate customs that are not lawful for us as Romans to accept or practice" (Acts 16:20–21). The same pride collapses at the chapter's end when the magistrates discover they have publicly beaten and jailed Roman citizens without trial. Three locations from the narrative have been identified on the ground. The forum and the bema — the raised tribunal where the magistrates rendered judgment — have been excavated at the center of the colonial city. A Roman-era prison structure adjoining the forum is traditionally identified with the cell of Acts 16:23–34, though the identification is later and not epigraphically secure. The "place of prayer" by the river where Paul met Lydia (Acts 16:13) is conventionally located on the bank of the Krenides stream just outside the western gate, where a modern baptistery now stands. The Letter to the Philippians, written from prison around AD 60, is the church Paul founded on this plain writing back to him. Four basilicas of the fourth through sixth centuries AD overlie the colonial forum. Sources: Peter Pilhofer, Philippi, two volumes (Mohr Siebeck, 1995–2000); Joseph Hellerman, Reconstructing Honor in Roman Philippi (Cambridge, 2005); Charalambos Bakirtzis and Helmut Koester, eds., Philippi at the Time of Paul and after His Death (Trinity Press International, 1998); École française d'Athènes, Guide de Philippes (2014); Acts 16:11–40.
Philippi anchors the Pauline mission to a precisely located and extensively excavated Roman colonial landscape. The site's forum, bema, and prison structure allow Acts 16's civic confrontations to be read against actual archaeological remains, grounding narrative details about Roman legal status and colonial identity in verifiable material evidence.