Son of the general Constantine Diogenes and a prominent member of the Cappadocian Greek military aristocracy, Romanos rose to fame as a successful Akritai commander, serving in Syria and on the Danubi
Gold histamenon of Romanos IV: Michael VII Doukas flanked by his brothers Andronikos and Konstantios on the obverse, Romanos IV and Eudokia Makrembolitissa crowned by Christ on the reverse
Copper follis of Romanos IV. The obverse shows Christ Pantokrator, while the reverse depicts a cross quartered with the letters ϹΒΡΔ for the motto Σταυρὲ σου βοήθει Ρωμανόν δεσπότην ("Thy Cross aid the Lord Romanos").