after Easter (3 April): Bishop Eusebius of Nicomedia baptizes Constantine.
22 May, Pentecost: Constantine dies at Ancyrona, a suburb of Nicomedia. Nicomedia is known today as Izmit, Turkey.
late summer: Hannibalianus, nephew and son-in-law of Constantine and husband of Constantina is put to death during the purges of the imperial family after the death of Constantine.
9 September: Constantine II, Constantius II, and Constans assume to title of Augustus.