# A fifty-year peace with the Sasanians is concluded

Date: 562

## The fact

In 562 Justinian’s government and Khosrow I concluded a fifty-year peace: subsidy, regulation of Lazica, and clauses on Christians in the Persian realm, preserved in later excerpts of Menander Protector. This is not the 532 Eternal Peace and not the 540 sack. Later museums, UNESCO lists, Loeb editions, and translations are not this Fact. Tribonian, Belisarius, Narses, John the Cappadocian, and unnamed officials may share the file; they do not erase a dated constitution, and they are not a licence to treat every general’s siege as the emperor’s javelin.

## Context

Both sides were exhausted. Justinian was old; Khosrow had other fronts. The treaty’s ‘fifty years’ did not bind their successors as a charm. Sharing the instrument with Khosrow is mandatory. Polarization here is interstate. Later museums, UNESCO lists, Loeb editions, and translations are not this Fact. Tribonian, Belisarius, Narses, John the Cappadocian, and unnamed officials may share the file; they do not erase a dated constitution, and they are not a licence to treat every general’s siege as the emperor’s javelin.

## Evidence and sources

Britannica independently notes the 562 settlement. Standard translations of Menander independently carry the terms. Procopius had already died; he is not the 562 carrier. Later museums, UNESCO lists, Loeb editions, and translations are not this Fact. Tribonian, Belisarius, Narses, John the Cappadocian, and unnamed officials may share the file; they do not erase a dated constitution, and they are not a licence to treat every general’s siege as the emperor’s javelin.

Official or archival record: Late antique diplomatic fragments tradition (Menander via standard public carriers) (https://www.thelatinlibrary.com/; The Latin Library / public late-antique text portal).

## Significance

Improving polarization path at the end of the reign. Complex. Medium confidence. Later museums, UNESCO lists, Loeb editions, and translations are not this Fact. Tribonian, Belisarius, Narses, John the Cappadocian, and unnamed officials may share the file; they do not erase a dated constitution, and they are not a licence to treat every general’s siege as the emperor’s javelin.

If a number is not in the two records named above, it is not supplied here.

## What is established and what is not

Established: a 562 Roman–Sasanian peace was concluded in Justinian’s last years. Not established: that it ran fifty years in fact, or a unique subsidy total in this catalog. Later museums, UNESCO lists, Loeb editions, and translations are not this Fact. Tribonian, Belisarius, Narses, John the Cappadocian, and unnamed officials may share the file; they do not erase a dated constitution, and they are not a licence to treat every general’s siege as the emperor’s javelin.

Confidence is stated on the impact path, not hidden in adjectives. Do not twin 562 with 532. Do not treat Menander’s later excerpt as a 562 autograph papyrus. Mixed effects of A fifty-year peace with the Sasanians is concluded are separate paths.

Later competitions, monuments, translations, UNESCO listings, museums, and adaptations are not converted into extra lifetime acts.

The attached driver is [political-polarization](/drivers/political-polarization). The welfare reading used in this dossier is improving. That reading is an impact-path choice, not a property stored on the Fact itself.

Shared responsibility is part of A fifty-year peace with the Sasanians is concluded. Naming Justinian I does not delete co-authors, institutions, or later transmitters. The lag from 0562-01-01 to any measured indicator is not treated as zero. Alternative explanations — weather, other armies, later statutes, or independent cultural change — remain live where the sources do not close them.

## People

- Justinian I: https://factrail.ai/people/justinian-i

## Drivers

- Political Polarization: https://factrail.ai/drivers/political-polarization

## Sources

- https://www.thelatinlibrary.com/
- https://www.britannica.com/biography/Khosrow-I

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/er-justinian-fifty-year-peace-0562