# Constantine’s gold solidus becomes the durable late-Roman monetary unit

Date: 310

## The fact

From about 310 Constantine’s mints struck a gold solidus of relatively stable weight that, after 324, became the late empire’s accounting gold.

It is one event.

## Context

Stable gold can be fiscal infrastructure and can be a tax demand in gold. Split extractive building. This stores the monetary standard.

[Constantine the Great](/people/constantine-the-great)’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.

Solidus from c. 310–312 in his mints, then empire-wide after 324. Later Byzantine continuation is not his 337 death-year act.
Named person as heading of the dated public instrument. Later editors, museums, printers, or offices share publication. Complex where later carriers date the row.

## Evidence and sources

British Museum coin holdings and Britannica independently treat the solidus as his durable monetary instrument.

Official or archival record: British Museum collection — Constantinian coinage and portraits (https://www.britishmuseum.org/collection; British Museum).

## Significance

A stable gold unit is a fiscal-sustainability path of high confidence on the coin, medium on welfare for the unmonetized poor.

A coin is not [Constantinople](/people/bartholomew-i-of-constantinople)’s spolia.

A stable gold unit is a fiscal-sustainability path of high confidence on the coin, medium on welfare for the unmonetized poor.

## What is established and what is not

Established: the solidus originates in his mints and became the late-Roman gold. Not established: that it ended inflation in bronze, or a unique GDP 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 Constantine the Great.

What would change the picture: a contradictory original with a different date, signatory, or non-occurrence; a demonstrated forgery; or a measured series that can be argued, with lag and alternatives, as a consequence of this instrument rather than of other causes.

They are not a public rating.

## People

- Constantine the Great: https://factrail.ai/people/constantine-the-great

## Drivers

- Fiscal-Policy Sustainability: https://factrail.ai/drivers/fiscal-policy-sustainability

## Sources

- https://www.britannica.com/biography/Constantine-I-Roman-emperor
- https://www.britishmuseum.org/collection

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/co-solidus-coinage