This above map depicts the dioceses and provinces of the Roman Empire
following the restructuring of Diocletian. Principal settlements of the period are also labeled.
Lived from c. 245 to c. 312 A.D.
Roman Emperor from November 20, 284 to May 1, 305 A.D.
(also known as Constantine I or Constantine the Great)
Lived from February 27, 272 to May 22, 337 A.D.
Roman Emperor from 306 to 337 A.D.