Marcus Aurelius makes Commodus Caesar then co-emperor in 176–177 as received
In 176–177 Commodus was raised to Caesar and then to co-Augustus with Marcus Aurelius as received chronology. This Fact is that joint-rule instrument, not the 180 sole accession and not a unique adoption-debate treatise. In the causal graph this event strengthens Democratic Resilience, a driver that strengthens Having a say in government — an improving welfare path.
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In 176–177 Commodus was raised to Caesar and then to co-Augustus with Marcus Aurelius as received chronology. This Fact is that joint-rule instrument, not the 180 sole accession and not a unique adoption-debate treatise.
Context
A named co-emperor is dynastic continuity. Senatorial sources already dislike the hereditary turn.
Commodus’s documented role is bounded by other offices and collaborators named in the sources below.
Hereditary promotion breaks the adoptive Antonine practice. Dio and later lives print the dates. Marcus is the father-author of the promotion; Commodus is the named son. Coins carry the Caesar/Augustus heading.
Why it matters
Joint rule is a continuity path. Confidence high on the heading, medium on any unique stability series.
Who was responsible
Contribution type and responsibility level for each recorded actor — not sole-author shorthand.
Commodus
PersonDirect responsibility
responsibility level 0.4 · verified
What changed
Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.
- FactMarcus Aurelius makes Commodus Caesar then co-emperor in 176–177 as received
- strengthensDriverDemocratic Resilience
- strengthensIndicators (3)Having a say in government
impact weight 0.5 · Effect from 1 January 177 · verified
Joint rule is a continuity path. Confidence high on the heading, medium on any unique stability series.
Strengthens · Relationship strength 0.35 (weight 0.5 × strength 0.7)
Observed
29.8% of population aged 16-65 years · 8.13 below the normal line (2023)
Worse than normalTwo readings: 30.2% of population aged 16-65 years (2021) and 29.8% of population aged 16-65 years (2023).
20212023 Above normal = better
Strengthens · Relationship strength 0.23 (weight 0.5 × strength 0.45)
Observed
0.53 score from 0 to 1 · 0.34 below the normal line (2024)
Worse than normal125 readings, 1900–2024: rose from 0.17 score from 0 to 1 to 0.53 score from 0 to 1.
Above normal = better
Strengthens · Relationship strength 0.23 (weight 0.5 × strength 0.45)
Observed
0.55 index score (0-1) · 0.26 below the normal line (2024)
Worse than normalAbove normal = better
Evidence
The sources behind this fact and its verification state.
- 1.Cassius Dio Book 73 (Loeb English) — CommodusLacusCurtius / University of Chicago · High credibility · verified
- 2.Britannica — CommodusEncyclopaedia Britannica · High credibility · verified
What the sources establish
Britannica and Loeb Dio independently date the 177 co-emperorship.
Established: 177 co-emperor as received. Not established: that the promotion uniquely caused 192.
Commodus did not file a later UNESCO form, a later Loeb colophon, or a later museum label as a personal act. A co-Augustus is not a gladiator. Split 177 from the 192 arena file.
Causal path
How this event connects to drivers and indicators in the graph.
- ActorCommodus
- contributed toFactMarcus Aurelius makes Commodus Caesar then co-emperor in 176–177 as received
- strengthensDriverDemocratic Resilience
- strengthensIndicatorHaving a say in government
Cite this page
Factrail. (2026). Marcus Aurelius makes Commodus Caesar then co-emperor in 176–177 as received. Factrail. https://factrail.ai/facts/com-caesar-coemperor-177
https://factrail.ai/facts/com-caesar-coemperor-177
Accessed 16 October 2026.
By the Factrail desk · Method: how we source and score · Last reviewed
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