Diocese of Dacia

Diocese of Dacia Dioecesis Daciarum Διοίκησις Δακίας
Diocese of the Roman Empire
ca. 337 – ca. 602
Dioceses of Dacia and Thrace in 400 AD
Capital	Serdica (modern Sofia)
Historical era	Late Antiquity
• Split from Diocese of Moesia	ca. 337
• Merged into the newly formed Praetorian prefecture of Illyricum	357
• Merged into the Praetorian prefecture of Italy	384
• Merged back into Illyricum after Theodosius' death	395
• Devastated by the Avars and the Slavs	ca. 602

The Diocese of Dacia (Latin: Dioecesis Daciae) was a diocese of the later Roman Empire, in the area of modern western Bulgaria, central Serbia, Montenegro, Kosovo, northern Albania and northern North Macedonia. It was subordinate to the Praetorian prefecture of Illyricum. Its capital was at Serdica (modern Sofia).