# Commodus becomes sole emperor on Marcus Aurelius’s death, 17 March 180

Date: 180

## The fact

On 17 March 180 Marcus died on the Danube and [Commodus](/people/commodus) became sole emperor as received. This Fact is that succession instrument. Dio prints a decline-heading; that colour is attributed, not upgraded to a unique GDP series.

It is one event.

## Context

A 19-year-old hereditary princeps after a philosopher-father is a [democratic-resilience](/drivers/democratic-resilience)-adjacent shock in later senatorial memory. Offsets of early continuity sit on the peace row.

Commodus’s documented role is bounded by other offices and collaborators named in the sources below. Sharing a field with them is not a reason to drop a documented act, and it is not a reason to assign later consequences done in the name after death.

Dio’s famous gold-to-iron remark is a senatorial artist’s verdict, not a metal assay. Sole rule is a dated succession. Hereditary break with adoption is the political path. He did not typeset Loeb.

Named person as heading of the dated public instrument. Later editors, museums, printers, or offices share publication. Complex where later carriers are the surviving public file.

## Evidence and sources

Britannica and Loeb Dio independently date 17 March 180 as the sole-rule start.

Official or archival record: Britannica — Commodus (https://www.britannica.com/biography/Commodus; Encyclopaedia Britannica).

## Significance

Hereditary sole rule after adoptive practice is a continuity-risk path in the received file. Confidence high on the date.

## What is established and what is not

Established: sole emperor from 17 March 180. Not established: Dio’s iron age as a measured series.

What would change the picture: a contradictory original with a different date or name, or a measured series that can be argued, with lag and alternatives, as a consequence of this instrument rather than of later institutions.

The date is the date of this instrument, not a licence to back-date every later harm or benefit.

Established here: a sourced, dated public instrument with a named contribution by Commodus.

They are not a public rating.

The driver `democratic-resilience` is attached because the mechanism named in Significance follows from this instrument, not because a standing list of welfare headings needed another tick. Commodus did not file a later UNESCO form, a later Loeb colophon, or a later museum label as a personal act. A portrait or conventional bust is not this mechanism. Allegation, reconstruction, and established occurrence stay distinct. A deathbed succession is not a gladiator bout. Keep 180 distinct from 192. Keep the carrier date of later English distinct from the received historical year stored in the date field. Do not read a later English edition as a recovered autograph of Commodus.

## People

- Commodus: https://factrail.ai/people/commodus

## Drivers

- Democratic Resilience: https://factrail.ai/drivers/democratic-resilience

## Sources

- https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Cassius_Dio/73*.html
- https://www.britannica.com/biography/Commodus

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/com-sole-rule-180