Editing Romanos I Lekapenos (section)

==War and peace with Bulgaria==
{{main|Byzantine–Bulgarian war of 913–927}}
[[File:60-manasses-chronicle.jpg|thumb|A feast in honor of [[Simeon I of Bulgaria]] and Romanos engaging the Bulgarians, from the 14th century [[Constantine Manasses|''Manasses Chronicle'']].]]
The first major challenge faced by the new emperor was the [[Byzantine–Bulgarian war of 913–927|war with Bulgaria]], which had been re-ignited by the regency of Zoe. The rise to power of Romanos had curtailed the plans of [[Simeon I of Bulgaria]] for a marital alliance with Constantine VII, and Romanos was determined to deny the unpopular concession of imperial recognition to Simeon, which had already toppled two imperial governments.  Consequently, the first four years of Romanos' reign were spent in warfare against Bulgaria. Although Simeon generally had the upper hand, he was unable to gain a decisive advantage because of the impregnability of Constantinople's walls. In 924, when Simeon had once again blockaded the capital by land, Romanos succeeded in opening negotiations.

[[File:61-manasses-chronicle.jpg|thumb|Simeon orders the burning of the [[Church of St. Mary of the Spring (Istanbul)|Church of St. Mary of the Spring]] outside the [[walls of Constantinople|Theodosian Walls]].]]
Meeting Simeon in person at [[Kosmidion]], Romanos criticized Simeon's disregard for tradition and Orthodox Christian brotherhood and supposedly shamed him into coming to terms and lifting the siege. In reality, this was accomplished by Romanos' tacit recognition of Simeon as emperor of Bulgaria. Relations were subsequently marred by continued wrangling over titles (Simeon called himself emperor of the ''Romans'' as well), but peace had been effectively established.

On the death of Simeon in May 927, Bulgaria's new emperor, [[Peter I of Bulgaria|Peter I]], made a show of force by invading Byzantine [[Thrace]], but he showed himself ready to negotiate for a more permanent peace. Romanos seized the occasion and proposed a marriage alliance between the imperial houses of Byzantium and Bulgaria, at the same time renewing the Serbian-Byzantine alliance with [[Časlav Klonimirović|Časlav of Serbia]], returning independence the same year.  In September 927 Peter arrived before Constantinople and married [[Eirene Lakapena|Maria]] (renamed Eirene, "Peace"), the daughter of Romanos' eldest son and co-emperor Christopher, and thus his granddaughter. On this occasion Christopher received precedence in rank over his brother-in-law Constantine VII, something which compounded the latter's resentment towards the Lekapenoi, the Bulgarians, and imperial marriages to outsiders (as documented in his composition ''[[De Administrando Imperio]]''). From this point on, Romanos' government was free from direct military confrontation with Bulgaria. Although Byzantium would tacitly support a [[Medieval Serbia|Serbia]]n revolt against Bulgaria in 931, and the Bulgarians would allow [[Hungarian people|Magyar]] raids across their territory into Byzantine possessions, Byzantium and Bulgaria remained at peace for 40 years, until [[Sviatoslav's invasion of Bulgaria]].