 Constantine was one of the youngest sons of Romanos I and his wife Theodora . Theophanes Continuatus mentions him as the youngest son of the imperial couple , while the 11th @-@ century chronicler George Kedrenos mentions him as the third of four known sons . His older brothers were Christopher Lekapenos ( co @-@ emperor 921 – 931 ) and Stephen Lekapenos ( co @-@ emperor 924 @-@ 945 ) . It is unclear if Theophylact ( Patriarch of Constantinople in 933 – 956 ) was his younger brother or slightly older than he was . His sisters included Helena , who married Constantine VII Porphyrogennetos ( r . 913 – 959 ) , and Agatha , who married Romanos Argyros . He probably also had at least two unnamed sisters , known only because of their marriages to the <unk> Romanos Mosele and Romanos <unk> . 
