Leo Argyre

-http://fmg.ac/Projects/MedLands/BYZANTIUM.htm#ArgyrefatherRomanosIIIB

4. LEO (-killed Italy Nov 1017). Lupus Protospatarius records that "Marsedonici catepanus" died "in Butruntio" in 1017 and that "Leo frater Argiro" was killed in Nov 1017[1571]. The fact that the same source records the death of "Argiro Barensis" (which must indicate Emperor Romanos III) in Constantinople in 1034 suggests that the future emperor may have been the same person as the brother of Leo[1572].