8 Nov 324–11 May 330Constantine rebuildsByzantium as Constantinople
325–329?Persians expel Arabsand reconquereastern Arabia
May–Aug 325Council of Nicaeapushes for Christian unity
326–328?Constantine executeshis son Crispus and wife Fausta
326Roman dioceses organizedunder prefectures
Jul 328–?? 329Constantine defeatsTervingi on Danube
Sep 328–?? 329?Constantine defeatsGerman tribes on Rhine
329?–330?Persians invadeKushano-SasanianKingdom
329?–330?Romans defeatAlemanni onUpper Rhine