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| Treaty of 907 | |
|---|---|
| Name | Treaty of 907 |
| Date signed | 907 |
| Location signed | Constantinople |
| Signatories | Byzantine Empire; First Bulgarian Empire |
| Language | Medieval Greek; Old Church Slavonic |
| Condition effective | 907 |
| Related events | Battle of Bulgarophygon; Byzantine–Bulgarian wars |
Treaty of 907 The Treaty of 907 was a diplomatic settlement concluded in 907 between the Byzantine Empire and the First Bulgarian Empire that followed a period of intensified warfare during the early 10th century. It sought to formalize borders, regulate commerce, and secure a fragile peace after campaigns involving the Theme system, raids by Khan Simeon I, and naval operations in the Aegean Sea. The accord influenced subsequent interactions among the Byzantine imperial court, the Bulgarian Khanate, and neighboring polities such as the Principality of Serbia and the Magyars.
In the decades preceding 907, the Byzantine–Bulgarian wars escalated as the First Bulgarian Empire under rulers including Krum and later Simeon I of Bulgaria contested control of the northern Balkans. The Byzantine Empire sought to defend strategic themes like the Theme of Thrace and the Theme of Macedonia against raids and sieges that targeted cities such as Adrianople and Constantinople. Diplomatic precedent for negotiation existed in earlier accords, notably treaties following the Battle of Pliska and the accord after the Rus'–Byzantine War (907?); those precedents informed Byzantine envoys and Bulgarian diplomats responding to shifting alliances involving the Pechenegs, Serbs, and Byzantine vassals.
Negotiations marshaled envoys from the Byzantine imperial court—including officials from the Bureau of the Logothetes and commanders of themes—and delegates of the First Bulgarian Empire representing the khanate and ecclesiastical interests of the Bulgarian Orthodox Church. Principal signatories included a Byzantine Emperor's plenipotentiary from the House of Constantinople and a Bulgarian delegation acting for the ruling house, which by 907 had been shaped by successions traced to Khan Omurtag and the rising prestige of Simeon I of Bulgaria. Third parties such as merchants from Ragusa and agents of the Venetian Republic observed portions of the talks owing to the treaty's commercial clauses, while the Patriarchate of Constantinople and Bulgarian clerical leaders monitored religious implications.
The treaty delineated frontier arrangements along contested stretches of the Balkan Peninsula, specifying control over hinterlands adjacent to the Maritsa River and routes linking Thessalonica to inland strongholds. It established regulated trade terms for merchants of Constantinople, Pliska, and ports in the Aegean Sea, stipulating tolls, safe-conducts, and privileges for caravans and riverine commerce. Provisions addressed prisoner exchanges after sieges, the status of fortified towns such as Develtos and Mesembria, and limits on naval raids by fleets operating from Bithynia and Kavala. Clauses sought to define the roles of frontier magnates and to limit unilateral incursions by allied groups like the Magyars and Pechenegs. The agreement also treated ecclesiastical jurisdictional questions between the Patriarchate of Constantinople and emerging Bulgarian episcopal structures, affecting the use of Old Church Slavonic in liturgy and clerical appointments.
Implementation relied on a combination of garrison rotations in frontier themes, inspections by imperial logothetes, and mutual guarantors drawn from influential aristocrats and boyars. The Byzantine navy retained patrol responsibilities in the Aegean Sea while Bulgarian border forces secured land passes, using fortified centers as enforcement nodes. Enforcement mechanisms included scheduled envoy exchanges, formal oaths sworn before ecclesiastical authorities, and stipulated penalties for violations—ranging from reparations payable in coin minted in Constantinople to sanctioned retaliatory expeditions. Third-party guarantors such as the Venetian Republic and merchants from Ragusa served as commercial arbitrators for disputes over tolls and merchant privileges.
Immediately following ratification, a reduction in major pitched battles occurred along key corridors, allowing resumed trade between Constantinople and Balkan markets; grain and silk flows restarted via established routes to Thessalonica and ports on the Aegean Sea. The accord temporarily stabilized the northern frontier, enabling the Byzantine administration to reallocate forces to other theaters, including campaigns against Arab raids in Crete and diplomatic missions to the Holy Roman Empire. For the First Bulgarian Empire, the treaty consolidated control of certain border territories and enhanced recognition of Bulgarian ecclesiastical claims, facilitating cultural exchange and the spread of Old Church Slavonic literacy and clerical organization.
The Treaty influenced subsequent Byzantine-Bulgarian relations by setting precedents for negotiated settlements that balanced military pressure with economic incentives; its framework informed later accords during the reigns of Basil I and Leo VI the Wise and echoed in treaties preceding the Treaty of 927. It had enduring effects on the development of frontier administration in the Balkans, on mercantile law affecting Venice and Ragusa, and on ecclesiastical politics between the Patriarchate of Constantinople and Bulgarian clerical bodies, contributing to later disputes culminating in formal recognition processes. Historians link the treaty to broader medieval trends in diplomatic practice involving oath-bound guarantors, frontier chartering, and commercial regulation across the Mediterranean and Danubian corridors.
Category:Treaties of the Byzantine Empire Category:Treaties of medieval Bulgaria