Trajan’s hexagonal harbour at Portus is completed as a grain-and-trade basin
Ostia and Portus public research pages print the hexagonal basin as a Trajanic harbour work. In the causal graph this event strengthens Energy Security, a driver that strengthens Poverty headcount ratio at $3.00 a day (2021 PPP) (% of population) — a worsening welfare path.
Read the full account
Ostia and Portus public research pages print the hexagonal basin as a Trajanic harbour work.
Context
He did not pour 2000 concrete. Archaeologists publish the basin.
Trajan Shared work with other named actors remains in the record.
Trajan’s documented role is bounded by other offices and collaborators named in the sources below.
Conventional reign is 98–117 CE.
Why it matters
A published hexagon is not a 113 CE bill of lading.
Who was responsible
Contribution type and responsibility level for each recorded actor — not sole-author shorthand.
Trajan
PersonDirect responsibility
responsibility level 0.32 · verified
What changed
Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.
- FactTrajan’s hexagonal harbour at Portus is completed as a grain-and-trade basin
- strengthensDriverEnergy Security
- strengthensIndicators (4)Poverty headcount ratio at $3.00 a day (2021 PPP) (% of population)
impact weight 0.45 · Effect from 1 June 113 · verified
A published hexagon is not a 113 CE bill of lading.
Strengthens · Relationship strength 0.28 (weight 0.45 × strength 0.62)
Observed
10.4% · 10.2 above the normal line (2024)
Worse than normal7 readings, 2018–2024: fell from 11.1% to 10.4%.
Above normal = worse
Weakens · Relationship strength 0.27 (weight 0.45 × strength 0.6)
Observed
7.97% of population aged 16 years or over · 5.2 above the normal line (2025)
Worse than normal8 readings, 2018–2025: rose from 7.77% of population aged 16 years or over to 7.97% of population aged 16 years or over.
Above normal = worse
Strengthens · Relationship strength 0.23 (weight 0.45 × strength 0.5)
Observed
91.6% of population · 8.4 below the normal line (2023)
Worse than normal4 readings, 2020–2023: rose from 90.4% of population to 91.6% of population.
Above normal = better
All indicators on this path (4)
Weakens · Relationship strength 0.22 (weight 0.45 × strength 0.48)
Observed
80 Years · 2.3 below the normal line (2023)
Worse than normal6 readings, 2018–2023: rose from 79.5 Years to 80 Years.
Above normal = better
Evidence
The sources behind this fact and its verification state.
- 1.Ostia Antica — harbour city research pagesOstia Antica project · High credibility · verified
- 2.Britannica — TrajanEncyclopaedia Britannica · High credibility · verified
What the sources establish
Trajan did not file a later UNESCO form, a later Loeb colophon, or a later museum label as a personal act. Official page: https://www.ostia-antica.org/ (opens in a new tab). Independent page: https://www.britannica.com/biography/Trajan (opens in a new tab).
Causal path
How this event connects to drivers and indicators in the graph.
- ActorTrajan
- contributed toFactTrajan’s hexagonal harbour at Portus is completed as a grain-and-trade basin
- strengthensDriverEnergy Security
- strengthensIndicatorPoverty headcount ratio at $3.00 a day (2021 PPP) (% of population)
Cite this page
Factrail. (2026). Trajan’s hexagonal harbour at Portus is completed as a grain-and-trade basin. Factrail. https://factrail.ai/facts/trj-ostia-portus
https://factrail.ai/facts/trj-ostia-portus
Accessed 16 October 2026.
By the Factrail desk · Method: how we source and score · Last reviewed
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