Romanos (Ρωμανός) I Lekapenos (Λεκαπηνός) was a Byzantine and Eastern Roman emperor of the 10th century. He was known for his conflict with Simeon I of Bulgaria and campaigns in the east against the Abbasids with Ioannis Kourkouas as commander. Ioannis, famously during a Kievan raid, employed Greek fire; a technology which is now lost. Cities seized were those of Edessa and Melitene on these campaigns. He also formed a union with the church of Rome with his Tomos of Union.