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Commodus is assassinated on 31 December 192 in a palace plot involving Marcia, Laetus, and Narcissus as received

On 31 December 192 Commodus was killed in a palace conspiracy as Dio and Herodian print. In the causal graph this event strengthens Judicial independence erosion (court capture), a driver that strengthens Rule of Law Gap from the Highest Governance Score — a worsening welfare path.

Sources: [1][2]

Read the full account

On 31 December 192 Commodus was killed in a palace conspiracy as Dio and Herodian print. This Fact is that assassination as a dated extra-legal outcome, not a constitutional court and not Pertinax’s next-day accession as a second twin.

Context

Contribution is complex because he is the victim of the killing and the author of the reign that produced the plotters.

Commodus’s documented role is bounded by other offices and collaborators named in the sources below.

Marcia, the prefect Laetus, and the cubicularius Eclectus are the named conspirators; the wrestler Narcissus is the killer in the bath after poison fails. This is others’ act, stored as the outcome of the reign. He did not author his own strangling.

Why it matters

Assassination as succession method is a judicial-independence erosion for the principate. Confidence high on the date and the plot heading.

Who was responsible

Contribution type and responsibility level for each recorded actor — not sole-author shorthand.

  • Commodus

    Person

    Direct responsibility

    responsibility level 0.3 · verified

What changed

Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.

Evidence

The sources behind this fact and its verification state.

Verified2 sources on file
  1. 1.Herodian, Roman History — Livius EnglishLivius.org · High credibility · verified
  2. 2.Cassius Dio Book 73 (Loeb English) — CommodusLacusCurtius / University of Chicago · High credibility · verified
What the sources establish

Loeb Dio and Herodian independently date 31 December 192 and name Marcia, Laetus, and Narcissus.

Established: 31 December 192 killing as received. Not established: a unique reconstructed kill-list he had drafted that day.

Commodus did not file a later UNESCO form, a later Loeb colophon, or a later museum label as a personal act. A bath strangling is not the senate’s next-day damnatio.

Causal path

How this event connects to drivers and indicators in the graph.

  1. ActorCommodus
  2. contributed toFactCommodus is assassinated on 31 December 192 in a palace plot involving Marcia, Laetus, and Narcissus as received
  3. strengthensDriverJudicial independence erosion (court capture)
  4. strengthensIndicatorRule of Law Gap from the Highest Governance Score

Cite this page

Factrail. (2026). Commodus is assassinated on 31 December 192 in a palace plot involving Marcia, Laetus, and Narcissus as received. Factrail. https://factrail.ai/facts/com-assassination-192

https://factrail.ai/facts/com-assassination-192

Accessed 16 October 2026.

By the Factrail desk · Method: how we source and score · Last reviewed

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