The city of Iznik, called Nikaia or Nicaea in ancient times, is located in northwest Anatolia, Turkey. Nicaea is renowned especially for the first Council of Nicaea convened by the Roman emperor Constantine in AD 325 in an attempt to unify the Church. During an international field course on the geophysical exploration of archaeological targets we detected the remains of a small previously unknown Byzantine church on a fallow lot of land inside the city. The church is oriented parallel to the ancient Hippodamian street grid that deviates from the modern street system of the quarter by~45°. We found the contours of the nave, two aisles and three apses as well as evidence of a partly refilled grave. The geophysical measurements indicate that the foundations of the church consist of low-porosity hard rock with a low magnetic susceptibility, probably limestone or sandstone embedded in fluvial sediments. The field study is based on ground-penetrating radar (GPR), magnetics, electric resistivity tomography (ERT) and microgravimetry. It highlights the strength and necessity of combining different geophysical methods in exploring and characterizing archaeological sites. In fact, the foundation walls of the church do not show any magnetic anomaly but could be delineated clearly only by GPR. The wall remains appear as highly resistive spots in ERT. By converting the three-dimensional GPR image into an electric resistivity model we could verify that the ERT results fully correspond to the ruins found by GPR. The structure interpreted as a loosely refilled grave is indicated mainly by a weak gravity anomaly (~9 μGal) and a diffuse reflection pattern in GPR. Electric forward modelling shows that this structure leads to an additional increase of a high resistivity anomaly, which is primarily caused by foundation rocks, but it cannot be resolved within the ERT pattern a priori.

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Germia was a well-connected Byzantine polis in western-central Anatolia, famous for its healing waters and a church of St Michael. After three years of survey the site can now be reconstructed: it included several other churches and monasteries, but little space for ordinary residential buildings. This comes as a surprise, but can be explained by the discovery of two older Roman cities within walking-distance of Germia, where the ordinary people seem to have lived. One of these cities, Mantalos, was home to a local cult of the pagan god Men. This may explain why the Christian healing centre was established at Germia. Later, Mantalos shed its pagan legacy and was apparently renamed Eudoxias after a homonymous member of the Theodosian dynasty. No Roman or Byzantine settlement of the region has a history extending back beyond the Iron Age, when the population retreated to fortified hilltop settlements and many sizable Bronze Age höyüks were deserted. Settlement locations changed often and grew little in central Anatolia, and this may be blamed on the uniform landscape of the high plateau; it lacks the Mediterranean's diverse geography of ‘definite places’ that would favour one site above others and ensure its continuity and growth.

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