Year 587 (AD) — calendar, context and overview

Calendar and numbering

In the Julian scheme then in use across much of the Mediterranean world, a "common year" has 365 days. The Anno Domini system, devised in the early medieval period, retroactively assigns the number 587 to that span. Other contemporaneous calendars—Chinese regnal eras, Sassanid and Byzantine chronologies, and various Germanic dating conventions—were still predominant in their regions, so historians often cross-reference systems when linking events to AD 587.

Political and military context

The late 6th century was a period of shifting power across Eurasia. In western and central Europe, successor kingdoms formed from the remnants of Roman administration were engaged in local wars, dynastic struggles and migration. Italy remained a contested space where Byzantine authorities, local elites and Germanic kingdoms such as the Lombards interacted. In the Near East the Sassanid Persian state continued as a major power and engaged in rivalry with Byzantium.

East Asia and other regions

East Asia was under the early Sui dynasty in China, a regime that had begun consolidating control over the territory of the former Southern dynasties. The Sui rulers carried out administrative and military initiatives in the decades around 587 that would culminate in larger reunification efforts shortly afterward. Across other regions—South Asia, Southeast Asia, and sub-Saharan Africa—local polities followed their own timelines, with fewer synchronised written annals surviving for exact cross-dating.

Uses, sources and historiography

Modern treatments of the year 587 rely on a mixture of chronicles, inscriptions and later medieval compilations; many surviving primary narratives were composed decades or centuries later and must be read cautiously. Chronologists compare records from different cultural calendars to build cross-referenced timelines. For readers exploring primary or secondary sources, resources on the Julian calendar and on the Anno Domini system are useful starting points.

Notable distinctions and further reading

• The term "common year" here indicates 365 days in the Julian calendar rather than a leap year.
• Although historians use AD 587 for convenience, people in different regions at the time would not have shared that numbering.
• For comparative study, see general references on the Julian calendar, the development of Anno Domini dating, and regional chronologies such as Sui China and the Sassanid realm via chronological surveys.

Suggested starting points for further research: surveys of late antique Europe and the Near East (political histories), and works on early Sui administration and reunification efforts in China (East Asian chronologies).