Thessaloniki and the Tetrarchy

Around the year 300, Thessaloniki — the great Macedonian metropolis on the Via Egnatia, founded in 315 BC by Cassander — became one of the imperial residences of the Tetrarchy when the Caesar (later Augustus) Galerius made it a capital and adorned it with a monumental palace quarter, the Rotunda, the triumphal Arch (the Kamara), and a hippodrome. It was this same Galerius whom Lactantius names as the chief instigator of the Great Persecution that opened with Diocletian’s edict of 303 and ran until Galerius’s own deathbed edict of toleration in 311 — and it is precisely this persecution, in this city, that the Passio of Demetrios assigns as the setting of the martyrdom. This file establishes the real civic and historical stage; the historical Demetrios himself, and the lateness of his martyr-tradition, are treated in the companion files.

Tradition: Pan-Orthodox (Great Martyr; the Myrrh-Streamer)

The City Before the Tetrarchy

Thessaloniki was a Macedonian foundation of the early Hellenistic age. It was established in 315 BC by Cassander, son of Antipater, who synoecized the small towns clustered at the head of the Thermaic Gulf into a single city and named it for his wife Thessalonike, a half-sister of Alexander the Great (Strabo, Geography 7, fr. 21 and 24; Vickers 1972, 156–157). The site was superbly chosen: a sheltered harbour on the gulf, backed by fertile Macedonian hinterland, at the natural junction between the sea and the land routes north into the Balkans. From its origin the city was a metropolis in the older sense — a mother-city of Macedonia — and it never lost that primacy.

Under Roman rule its importance only grew. After the defeat of Perseus and the dissolution of the Macedonian kingdom in 168 BC, the Romans divided Macedonia into four districts, and Thessaloniki was made the capital of the second; when the whole region was organized as the province of Macedonia (148 BC), Thessaloniki became its administrative centre (Vickers 1972, 156). The decisive geographical fact, however, was the construction of the Via Egnatia, the great Roman trunk road begun in the 140s BC that ran from the Adriatic coast at Dyrrachium and Apollonia eastward across the Balkans to Thessaloniki and on toward Byzantium. Thessaloniki sat astride this road at its midpoint, where it met the sea-lanes of the Aegean, and so became one of the principal nodes of communication between the Latin West and the Greek East (Mitchell 2015, 7; Skedros 1999, 5–7). The Apostle Paul reached the city by the Via Egnatia and founded a church there in the early 50s, addressing to its Christians the two earliest documents of the New Testament, the Epistles to the Thessalonians (Acts 17:1–9; 1 Thessalonians 1:1; on the apostolic and pre-Constantinian Church see The Pre-Schism Church). By the end of the third century Thessaloniki was a large, wealthy, and strategically placed city — exactly the kind of place a Tetrarch would choose for a residence.

Galerius and the Making of an Imperial Capital

The transformation of Thessaloniki into an imperial capital belongs to the reorganization of the Roman world under Diocletian. In 293 Diocletian formalized a college of four rulers — the Tetrarchy — with two senior emperors (Augusti) and two junior emperors (Caesares), each based not at distant Rome but at a strategically chosen city near the frontiers (Barnes 1982, 4; Mitchell 2015, 56–60). Galerius Maximianus, raised to the rank of Caesar on 1 March 293 as the junior colleague of Diocletian in the East, was assigned responsibility for the Danubian and Balkan frontier, and he established his principal residences accordingly — at Sirmium on the Save, at Serdica, and at Thessaloniki (Barnes 1982, 37, 61–62; Leadbetter 2009, 1–3, 130–135).

Thessaloniki became Galerius’s seat above all in the years framing his great Persian victory. After defeating the Sassanid king Narseh in 298 — a triumph that gave the Tetrarchy its most spectacular military success — Galerius made Thessaloniki the showcase of his prestige, and the surviving monuments date from roughly 298/299 onward (Mitchell 2015, 60; Skedros 1999, 7–9). When Diocletian and Maximian abdicated on 1 May 305 and Galerius became Augustus, the city’s standing as an imperial residence was confirmed, and it remained closely associated with him until his death in 311 (Barnes 1982, 61–64; Leadbetter 2009, 130–135). The exact extent and continuity of his residence there is not perfectly documented: [Disputed: Barnes (1982, 61–64), reconstructing imperial movements from the dated subscriptions of laws, places Galerius at Thessaloniki at several points between 299 and 311 but cannot fix a continuous residence; Leadbetter (2009, 130–135) argues that Thessaloniki functioned as Galerius's principal capital especially in his years as Augustus (305–311), when the monumental quarter was completed]. What is not in doubt is that the city carried his stamp: it was, in the language of the period, a sedes imperii, a seat of empire.

The Galerian Building Programme

The physical evidence of Galerius’s Thessaloniki survives, in part, to this day, and it is the single most eloquent witness to what the city was around 300. Galerius laid out a great new quarter in the south-eastern sector of the city, organized along a monumental axis, and the principal elements of this complex can still be identified (Mitchell 2015, 60; Skedros 1999, 7–9).

The whole layout reflects the architectural ideology of the Tetrarchy, in which the emperor’s residence, his place of public appearance, and his monument of victory were drawn into a single ceremonial composition expressing the sacralized majesty of the ruler; the same impulse that placed Diocletian’s mausoleum within his fortified palace at Split set the imperial quarter of Thessaloniki along its processional spine (Mitchell 2015, 60; Skedros 1999, 7–9). At the heart of it stood the palace (the Galerian Palace), an extensive complex of audience halls, courtyards, baths, and residential apartments, excavated in the modern city centre and revealing the scale of a genuine imperial residence rather than a mere governor’s praetorium; an octagonal hall within the complex, richly decorated, has been read as a throne-room or audience chamber befitting an Augustus (Skedros 1999, 7–8). Adjoining the palace, Galerius built a hippodrome for the games that were an indispensable instrument of imperial display — the circus where emperor and people met — laid out on the eastern side of the complex (Skedros 1999, 8–9). Linking the palace quarter to the city’s monumental core ran a colonnaded processional way, and over it Galerius raised a great triumphal arch, known in Greek as the Kamara, whose sculptured piers — partly preserved — depict in relief the very Persian campaign against Narseh that had made his name, showing the Tetrarchs enthroned and the defeated enemy at their feet (Mitchell 2015, 60; Skedros 1999, 8–9). At the northern end of the axis stood the Rotunda, a massive domed cylindrical structure, almost certainly built as part of Galerius’s complex — variously interpreted as intended for a mausoleum or for an imperial cult-hall — which was later converted into a Christian church and survives today as one of the great monuments of the city (Skedros 1999, 8–9). Taken together, the palace, the hippodrome, the Arch, and the Rotunda form a coherent Tetrarchic ensemble of the kind found at the other imperial residences of the age — a piece of the same architectural language that produced Diocletian’s palace at Split — and they make the Tetrarchic city archaeologically present in a way that the martyr-tradition is not (Skedros 1999, 7–9; on the later Christianization of the city’s monuments see The Byzantine Church).

Galerius and the Great Persecution

It is the same Galerius — the builder of Thessaloniki’s imperial quarter — who stands at the centre of the last and greatest persecution of the Christian Church, and the principal source for his role is hostile but circumstantial and close in time: Lactantius, a Christian rhetorician who had himself taught at Diocletian’s court at Nicomedia, wrote his De mortibus persecutorum (“On the Deaths of the Persecutors”) within a few years of the events, around 313–315 (Barnes 1981, 13–14; Leadbetter 2009, 117–119).

Lactantius is emphatic that the driving force behind the persecution was not the aged and reluctant Diocletian but the fierce Caesar Galerius. In his narrative, Galerius pressed Diocletian over the winter of 302–303 to move against the Christians, and only after consultations — including, Lactantius says, the consultation of the oracle of Apollo at Miletus — did Diocletian yield (Lactantius, De mortibus persecutorum 10–11; trans. Creed 1984; Barnes 1981, 18–20). Eusebius, the great Christian historian of the next generation, independently records the same sequence of events from the side of the persecuted, dating the outbreak to the nineteenth year of Diocletian (Eusebius, Ecclesiastical History 8.2; Martyrs of Palestine, preface; Barnes 1981, 22–24).

The persecution unfolded through a series of edicts. The first edict, posted at Nicomedia on 24 February 303, ordered the destruction of churches and the burning of the Scriptures, the deposition of Christians from office and their loss of legal standing (Lactantius, De mortibus persecutorum 13; Eusebius, Ecclesiastical History 8.2; Barnes 1981, 22–24). Further edicts followed in the course of 303: a second ordering the imprisonment of the clergy, and a third offering imprisoned clergy release on condition of sacrifice — issued, Lactantius and Eusebius indicate, in connection with the celebration of Diocletian’s twentieth anniversary (Eusebius, Ecclesiastical History 8.2 and 8.6; Martyrs of Palestine 1; Barnes 1981, 24). A fourth edict, in early 304, extended the demand to sacrifice to the whole population on pain of death, and it is this general edict that produced the largest number of martyrs (Eusebius, Martyrs of Palestine 3; Barnes 1981, 24). [Disputed: the precise number and sequence of the edicts is reconstructed, not directly transmitted as a list — Barnes (1981, 22–24) sets out the standard four-edict scheme from the testimony of Lactantius and Eusebius; some scholars question whether all four were universally promulgated, since their enforcement in the West (under Constantius and the Maximian) was notably lighter than in Galerius's and Diocletian's territories]. The severity of enforcement varied sharply across the empire, and it fell hardest in the East and in the Balkan provinces under Galerius’s authority (Barnes 1981, 24; Leadbetter 2009, 119–123). In the western territories of Constantius, by contrast, enforcement seems to have gone little further than the demolition of churches, so that the persecution was in practice a regional rather than a uniform imperial event — concentrated precisely in the lands, including Macedonia, where Galerius held sway (Barnes 1981, 24; Leadbetter 2009, 119–123). This geographical fact matters for the Demetrios tradition: it places the legendary martyrdom in exactly the part of the empire, and under exactly the emperor, where the persecution bit hardest.

The persecution ended, as it had begun, with Galerius. Stricken with a horrible wasting disease — which Lactantius describes in lurid and providential detail — Galerius issued from Serdica, on 30 April 311, an edict of toleration in his own name and the names of his colleagues, conceding that the policy of compulsion had failed and granting the Christians leave to exist again and to pray for the emperor’s recovery (Lactantius, De mortibus persecutorum 33–34; Eusebius, Ecclesiastical History 8.17; Barnes 1981, 39–40; Leadbetter 2009, 1–3). Galerius died within days of the edict, in May 311 (Barnes 1982, 6; Leadbetter 2009, 1–3). The toleration of 311 was thus the work of the very persecutor, and it preceded by two years the more famous settlement associated with Constantine and Licinius at Milan in 313 (Barnes 1981, 48–49).

The City as the Stage of the Martyr-Tradition

This is the historical setting that the hagiography of Demetrios presupposes. The several recensions of the Passio sancti Demetrii place the martyrdom at Thessaloniki during a visit of Galerius — sometimes named Maximian, the persecuting emperor of the legend — and frame it within exactly this persecution: the confession of Christ before the emperor, the imprisonment, and the execution by spearing in the prison cell (Skedros 1999, 9–14; and see The Confession and the Imprisonment). The legend’s geography is therefore genuinely Tetrarchic. A persecuting emperor who resided at Thessaloniki, a great public arena attached to his palace, an imperial court before which a Christian might be brought to confess — all of this corresponds to the real city of Galerius described above, even where the particular narrative details cannot be confirmed.

But the correspondence of the setting must not be confused with the confirmation of the event. The civic stage is solidly attested by archaeology and by the historians of the persecution; the martyrdom of Demetrios is not. No contemporary act of a martyr Demetrios at Thessaloniki survives; the Passio is centuries later than the events it describes; and serious scholarship has even questioned whether the original martyr belonged to Thessaloniki at all, or migrated there in tradition from Sirmium on the Danube — another of Galerius’s own residences (Skedros 1999, 9–18; Woods 2000, 221–234; and see The Historical Core and From Sirmium to Thessaloniki). The honest sequence, then, is to fix the city first and the saint second: Thessaloniki around 300 is a place we can describe with confidence, a Tetrarchic capital stamped with the monuments and the violence of Galerius; what grew up within it as the cult of Demetrios is a matter for the companion files, where its late and layered attestation is examined on its own terms.

References

Barnes, Timothy D. The New Empire of Diocletian and Constantine. Cambridge, MA: Harvard University Press, 1982. (Imperial chronology and residences; Galerius as Caesar from 1 March 293 and Augustus from 305; the dating of his movements and death in 311.)
Barnes, Timothy D. Constantine and Eusebius. Cambridge, MA: Harvard University Press, 1981. (The Great Persecution; the dating and contents of the edicts of 303–304; Galerius as instigator; the edict of toleration of 311 and the date of Lactantius’s De mortibus persecutorum.)
Eusebius of Caesarea. Ecclesiastical History (HE) 8.2, 8.6, 8.17; Martyrs of Palestine. (Contemporary Christian record of the outbreak of the persecution, the edicts, and the toleration of 311; trans. NPNF II/1.)
Lactantius. De mortibus persecutorum (“On the Deaths of the Persecutors”) 10–13, 33–34. Edited and translated by J. L. Creed. Oxford: Clarendon Press, 1984. (Names Galerius as the chief instigator of the persecution; the first edict of 24 February 303; Galerius’s disease and the edict of toleration of 30 April 311.)
Leadbetter, Bill. Galerius and the Will of Diocletian. London and New York: Routledge, 2009. (Galerius’s career, his Balkan residences including Thessaloniki, his role in the persecution, and the edict of 311.)
Mitchell, Stephen. A History of the Later Roman Empire, AD 284–641. 2nd ed. Chichester: Wiley-Blackwell, 2015. (The Tetrarchic system and its capitals; the Galerian monuments of Thessaloniki and their relation to the Persian victory of 298.)
Skedros, James C. Saint Demetrios of Thessaloniki: Civic Patron and Divine Protector, 4th–7th Centuries CE. Harrisburg: Trinity Press International, 1999. (The Tetrarchic city, the Galerian building programme — palace, hippodrome, Arch/Kamara, Rotunda — and the civic setting of the cult of Demetrios; the lateness of the Passio.)
Strabo. Geography 7, fragments 21 and 24. (On the foundation of Thessaloniki by Cassander in 315 BC and the synoecism of the towns of the Thermaic Gulf.)
Vickers, Michael. “Hellenistic Thessaloniki.” Journal of Hellenic Studies 92 (1972): 156–170. (The foundation, the Roman administrative role, and the Via Egnatia.)
Woods, David. “Thessalonica’s Patron: Saint Demetrius or Emeterius?” Harvard Theological Review 93, no. 3 (2000): 221–234. (The question whether the Thessalonian martyr-tradition is original to the city.)