Family/Spouse: Constantine "The Great" Emperor ROMAN EMPIRE. Constantine (son of Constantius I Chlorus Emperor ROMAN EMPIRE and Helena (St.) "Of The Cross" Of COLCHESTER) was born on 27 Feb 287-288 in Naissus, Moesia Superior (Now Nish, Serbia); died on 22 May 337 in Nicomedia. [Group Sheet] [Family Chart]