# Muhammad sends letters to neighbouring rulers as later sira dates a diplomatic round

Date: 628

## The fact

Around 628 CE later sira dates letters from [Muhammad](/people/muhammad) to neighbouring rulers. Surviving objects are contested. Muhammad's documented role is: He is credited with letters to Heraclius, the Negus, and others. Bearers travelled; authenticity of surviving letter-objects is disputed.

## Context

Heraclius and the Negus are the usual addressees. Sharing transmission with named bearers is required. Do not upgrade a later parchment to 628 autograph. The setting of Muhammad sends letters to neighbouring rulers as later sira dates a diplomatic round is the public file around 0628-09-01. Shared offices, unnamed crews, printers, or later editors may appear without becoming this instrument. Driver [social-cohesion](/drivers/social-cohesion) is attached because the significance names a mechanism from this act, not because a standing list needed coverage.

Confidence is stated on the impact path, not hidden in adjectives. Do not treat a museum letter as autograph. Low confidence is honest. Mixed effects of Muhammad sends letters to neighbouring rulers as later sira dates a diplomatic round are separate paths.

## Evidence and sources

Official locator: Britannica — Muhammad, letters to rulers at https://www.britannica.com/biography/Muhammad (Encyclopaedia Britannica). Independent locator: Fordham Islamic sourcebook neighbourhood for later letter traditions at https://sourcebooks.fordham.edu/islam/islamsbook.asp (Fordham University). Official carrier: Britannica — Muhammad, letters to rulers (https://www.britannica.com/biography/Muhammad; Encyclopaedia Britannica). Independent carrier: Fordham Islamic sourcebook neighbourhood for later letter traditions (https://sourcebooks.fordham.edu/islam/islamsbook.asp; Fordham University).

Official or archival record: Britannica — Muhammad, letters to rulers (https://www.britannica.com/biography/Muhammad; Encyclopaedia Britannica).

## Significance

Improving path from Muhammad sends letters to neighbouring rulers as later sira dates a diplomatic round on 0628-09-01. A diplomatic-letter round is a low-confidence cohesion path because physical letters are later contested objects. The welfare reading on this path is improving.

The attached driver is social-cohesion. The welfare reading used in this dossier is improving. That reading is an impact-path choice, not a property stored on the Fact itself.

## What is established and what is not

Established: a sourced public record of Muhammad sends letters to neighbouring rulers as later sira dates a diplomatic round under 0628-09-01 for Muhammad. Established: a sourced public record of Muhammad sends letters to neighbouring rulers as later sira dates a diplomatic round under 0628-09-01.

Shared responsibility is part of Muhammad sends letters to neighbouring rulers as later sira dates a diplomatic round. Naming Muhammad does not delete co-authors, institutions, or later transmitters. The lag from 0628-09-01 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.

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

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

## People

- Muhammad: https://factrail.ai/people/muhammad

## Drivers

- Social Cohesion: https://factrail.ai/drivers/social-cohesion

## Sources

- https://sourcebooks.fordham.edu/islam/islamsbook.asp
- https://www.britannica.com/biography/Muhammad

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/muh-letters-628