Byzantine–Bulgarian Treaty of 927 in the context of "Peter I of Bulgaria"

The siege of Constantinople was fought in June 922 at the outskirts of the capital of the Byzantine Empire, Constantinople, between the forces of the First Bulgarian Empire and the Byzantines during the Byzantine–Bulgarian war of 913–927. In the summer the Byzantine Emperor Romanos I Lekapenos sent troops under the commander Saktikios to repel another Bulgarian raid at the outskirts of the Byzantine capital. The Byzantines stormed the Bulgarian camp but were defeated when they confronted the main Bulgarian forces. During his flight from the battlefield Saktikios was mortally wounded and died the following night.

The Bulgarians, who by 922 were in control of most of the Balkans, continued to ravage the Byzantine countryside virtually unopposed. However, they lacked the maritime power to conduct a successful siege of Constantinople. The subsequent attempts to negotiate a Bulgarian–Arab alliance for a joint assault of Constantinople were discovered by the Byzantines and successfully countered. The strategic situation in the Balkans remained unchanged until both sides signed a peace treaty in 927, which recognized the imperial title of the Bulgarian monarchs and the complete independence of the Bulgarian Orthodox Church as an autocephalous Patriarchate.

The following is a list of patriarchs of All Bulgaria, heads of the Bulgarian Orthodox Church. The Bulgarian Orthodox Church was recognized as an autocephalous archbishopric in 870. In 918 or 919 the Bulgarian monarch Simeon I (r.  893–927) summoned a church council to raise the Bulgarian Archbishopric to a completely independent patriarchate. With the Byzantine–Bulgarian Treaty of 927, which affirmed the victory of the First Bulgarian Empire over the Byzantine Empire in the War of 913–927, the Ecumenical Patriarch of Constantinople recognized the Bulgarian Patriarchate.