Emperor Constantine of Byzantium I & Gregoria of Byzantium 
They had a son named Constans.
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Personal Details
Emperor Constantine of Byzantium I
Constantine was born on May 3rd, 0612.1 He died at the age of 29 in 0641.1
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Children
Emperor Constans of Byzantium II
Constans was born on November 7th, 0630.2 He died at the age of 38 in 0668.2
1 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I62137&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I63396&style=TABLE
2 http://wc.rootsweb.com/cgi-bin/igm.cgi?op=PED&db=jdp-fam&id=I63396&style=TABLE