Thessalonica

Thessalonica was founded in 316 BC by Cassander of Macedon and named for his wife, Thessalonike, the half-sister of Alexander the Great. Pompey made it a free city after the Third Macedonian War; under Augustus it became the seat of the Roman province of Macedonia and the principal stop on the Via Egnatia between Philippi and Dyrrachium. The modern Greek city of Thessaloniki overlies the ancient one continuously, which has constrained but never halted excavation: the Greek Archaeological Service and the Aristotle University of Thessaloniki have conducted rescue and research excavations across the urban core for more than a century. Acts 17:1–9 places Paul in the city around AD 49–50, preaching three sabbaths in the synagogue before a riot at the house of Jason drove him on to Beroea. Luke's distinctive term for the city magistrates — politarchs — was once dismissed as a Lukan invention, but more than seventy inscriptions from Macedonia now attest the office (the well-known Vardar Gate Politarch Inscription is treated separately in the Inscriptions corpus). Paul's two surviving letters to the Thessalonian church, written from Corinth shortly after his departure, are among the earliest documents of the New Testament — likely AD 50–51. Two later monuments embed the Christian continuity of the site. The Galerius Arch — the Kamara — was erected around AD 298–305 to commemorate the eastern emperor's Persian victories; its surviving piers stand astride the modern Egnatia avenue, their reliefs carrying the imperial-cult iconography against which the Thessalonian church grew. Half a kilometer north, the Basilica of Hagios Demetrios was raised in the fifth century AD over the traditional martyrdom site of the city's patron — a Roman officer executed under Galerius around AD 306 — and rebuilt successively after fires in 629 and 1917. The basilica preserves seventh-century mosaics of the saint. Thessaloniki remains the capital of Greek Macedonia; the Galerius Arch, the Rotunda, and Hagios Demetrios are part of the UNESCO Paleochristian and Byzantine Monuments inscription. Sources: Charles Edson, Inscriptiones Graecae X.2.1: Inscriptiones Thessalonicae et Viciniae (Berlin Academy, 1972); Karl P. Donfried, Paul, Thessalonica, and Early Christianity (Eerdmans, 2002); Holland Hendrix, "Thessalonicans Honor Romans" (PhD diss., Harvard, 1984); Laura Salah Nasrallah, Archaeology and the Letters of Paul (Oxford, 2019); Acts 17:1–9.