List of Byzantine Emperors (Eastern Roman Empire)

Titles and terminology

Early Roman court language used Latin designations such as Augustus and sometimes Dominus. From the reign of Heraclius onward the Greek title Basileus became the usual imperial style in official and diplomatic contexts. The emperor presented himself as both head of state and a supreme sovereign with religious and civil duties. The words and forms evolved, but the claim to Roman authority remained central.

Dynasties, succession and list conventions

Lists of emperors are organized by dynastic sequence, but the Byzantine succession was often complex. Co-emperors, junior colleagues and rival usurpers were frequent: some lists treat every crowned associate as an emperor, others restrict entries to sole or primary rulers. This package focuses on principal sovereigns while noting that many contemporaries ruled jointly or for brief intervals and that dating and recognition can vary by source and region.

Notable rulers (examples)

• Constantine I — established Constantinople as an imperial capital and promoted Christianity.
• Justinian I — sponsored major legal reform and ambitious military and architectural programs.
• Heraclius — restructured the state and adopted Greek as the court language; associated with the title change to Basileus.
• Basil II — expanded frontiers and consolidated central authority.
• Constantine XI — the last reigning emperor at the fall of Constantinople; his end marks the conventional termination of the imperial list.

Reading and uses of the list

Scholarship uses lists of emperors to track political continuity, legal authority, and cultural change across centuries. Entries typically include names, regnal epithets, and notes on co-rule, deposition or assassination. When consulting a list, check whether it records all crowned associates or only primary rulers, because many Byzantine sovereigns were proclaimed as juniors while others were merely claimants.

Further notes and sources

Primary materials for compiling a reliable list include chronicles, seals and coin evidence; modern compilations reconcile conflicting claims and chronological problems. For working definitions, the term "emperor" in Byzantine usage covered nuanced ranks and shared rule; scholars often annotate lists to explain contested reigns, short-lived co-rulers and regional recognitions of authority. Readers seeking detailed entries can follow specialized references and editions that annotate reigns, dates and dynastic links; many online and print resources present annotated lists and regnal tables for study and comparison. For concise lists and introductions consult standard reference works and dedicated chronologies.

reigning authorities and the context of their reigns are central to understanding how these lists are compiled and interpreted. For further orientation see general works on the Eastern Roman Empire and the institution of the emperor in Byzantine society.

Additional reference points: Augustus as an earlier imperial title; changes in court language and diplomacy as seen in sources that refer to the ruler as Basileus or a Roman sovereign. For an annotated roster beginning with Constantine at Constantinople see dedicated chronologies and catalogues of rulers.

Note: the selection and ordering of entries depends on editorial criteria and the treatment of co-rule, usurpation and recognition across different regions and periods.

For general introductions and curated lists consult summaries by modern compilers and academic overviews that synthesize literary, numismatic and sigillographic evidence (modern historians).