The paleochristian Church of Saint Demetrius founded in the fifth century by Leontius, praefectus of Illiricum and consacrated in 413 in Roman baths where Demetrios, a native of Thessalonica was killed on the order of Galerius.
See:
- James Constanine Skedros, Saint Demetrios of Thessaloniki : civic patron and divine protector, 4th–7th centuries CE. Harrisburg, Pa: Trinity Press International, 1999
- http://whc.unesco.org/en/list/456
- https://www.thebyzantinelegacy.com/demetrios-thessaloniki