Marmara Roman Communities

The sites represented by the Turkey_Roman_2 assemblage—Basilica at Iznik (ancient Nicaea) and Apollonia at Gölyazı—sit on the gently rimmed inland sea of the Marmara, a landscape of lakes, rivers and trade routes that linked Anatolia to the Aegean and Black Seas. Archaeological data indicates continuous habitation layered over Hellenistic and earlier Anatolian occupation, with urban rebuilding, civic architecture and Christian basilicas visible in the archaeological record between the late Republic and Late Antiquity (circa 100 BCE–400 CE).

Material remains from this period in Bithynia and adjacent provinces commonly show re-used classical masonry, new public buildings, and harbor installations that served both inland commerce and long-distance maritime networks. Epigraphic and architectural evidence across the region point to a mosaic of local Anatolian traditions and imported Roman institutions: provincial administration, new cultic spaces, and Christian congregational architecture by the fourth century. Limited evidence from the four sampled individuals suggests they lived within these dynamic, multiethnic towns—communities shaped by local continuity and incoming peoples, merchants and officials whose movements were propelled by trade, military service and religious change.

Archaeological interpretation must remain cautious: the material landscape is rich, but genetic sampling here is small, so any narrative of origin and emergence must be framed as provisional and open to revision as more data accrue.

DNA data from Turkey_Roman_2 comprise four mitochondrial genomes (mtDNA) sampled from Iznik and Apollonia, dated to roughly 100 BCE–400 CE. The observed mtDNA haplogroups are I (reported as I1 in the dataset), N, H and H5 — each represented once. These maternal lineages paint a picture of diversity consistent with a frontier of interaction between Anatolian, Mediterranean and broader European maternal ancestries.

Haplogroup H and its subclade H5 are widespread across Europe and the Near East in antiquity and the present day; their presence here is compatible with long-standing Anatolian and Mediterranean connections. Haplogroup N is an older West Eurasian basal lineage that appears intermittently in Near Eastern and European contexts and may reflect deeper local ancestry components. The mtDNA I lineage (not to be confused with Y-DNA I) is less common but documented across Eurasia and can signal northern/European links or local Anatolian variants—interpretation depends on subclade resolution not available in summary counts.

Crucially, no common Y-DNA pattern is reported for these samples, so paternal lineages and sex-biased mobility remain unresolved. With n=4, sample size is very small: limited evidence suggests mixed maternal origins, but conclusions about population structure, migration magnitudes, or continuity with earlier/modern populations are preliminary. Broader conclusions require larger, geographically and temporally distributed genomic datasets, Y-chromosome data and autosomal analyses to quantify ancestry components and detect sex-biased demographic processes.