# Apollodorus’s Danube bridge is built as a completed crossing for the Dacian wars

Date: 105

## The fact

Dio as public English and later engineering histories print a great Danube bridge under [Trajan](/people/trajan), attributed to Apollodorus. The dated carrier is that later cluster. A military bridge is infrastructure; it also enabled the war (other rows).

It is one event.

## Context

Shared credit with Apollodorus is required. Medium confidence on unique spans.

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. 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.

Conventional reign is 98–117 CE. Dated public instruments here are later inscriptions as published, Pliny as Loeb/Perseus, Dio as LacusCurtius, and museum or UNESCO pages.

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

LacusCurtius — Cassius Dio, Roman History and Cambridge studies on the age of Trajan independently describe this instrument.

Official or archival record: LacusCurtius — Cassius Dio, Roman History (https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Cassius_Dio/home.html; University of Chicago / LacusCurtius).

## Significance

A printed bridge is not a 105 CE load-test certificate.

## What is established and what is not

Established as a dated public record of this instrument.

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.

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 Trajan.

They are not a public rating.

The driver `industrial-policy-activism` is attached because the mechanism named in Significance follows from this instrument, not because a standing list of welfare headings needed another tick. Trajan 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.

## People

- Trajan: https://factrail.ai/people/trajan

## Drivers

- Industrial-Policy Activism: https://factrail.ai/drivers/industrial-policy-activism

## Sources

- https://www.cambridge.org/core/books/cambridge-companion-to-the-age-of-trajan/
- https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Cassius_Dio/home.html

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/trj-danube-bridge-as-later