 Constantine Lekapenos or Lecapenus ( Greek : Κωνσταντίνος <unk> ) was the third son of the Byzantine emperor Romanos I Lekapenos ( r . 920 – 944 ) , and co @-@ emperor from 924 to 945 . With his elder brother Stephen , he deposed Romanos I in December 944 , but was overthrown and exiled by the legitimate emperor Constantine VII ( r . 913 – 959 ) a few weeks later . Constantine was exiled to the island of Samothrace , where he was killed while attempting to escape sometime between 946 and 948 . 
