A monument built from other monuments

The most striking thing about the Arch of Constantine is that most of its sculpture was not created for the arch at all — it was lifted from older monuments. These reused reliefs are known as spolia (from the Latin spolium, "spoil" or "stripped trophy"). The arch is therefore a genuine collage, combining works by three different second-century emperors — Trajan, Hadrian and Marcus Aurelius — alongside new fourth-century reliefs. To understand the spolia is to read the arch as a fascinating historical "puzzle."

Why reuse ancient sculpture?

Historians have long debated the reasons behind the spolia. The leading theories:

  • Ideology: tying Constantine to the "good emperors" of the past (Trajan, Hadrian, Marcus Aurelius), signaling continuity and legitimacy.
  • Prestige and quality: reusing works of the highest artistic caliber, hard to match in the fourth century.
  • Speed: completing a grand monument quickly by drawing on sculpture that was already finished.

Most likely all of these reasons coexisted, making the spolia a choice that was as practical as it was symbolic.

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Where the reliefs come from

The spolia on the arch were taken from several different monuments:

  • The hunting and sacrifice roundels (tondi), from the age of Hadrian.
  • The large panels on the attic, from a monument of Marcus Aurelius.
  • Sections of the great frieze from the age of Trajan (the Dacian campaigns).
  • The statues of the Dacians crowning the attic, also Trajanic.

To these are added the fourth-century Constantinian reliefs, recognizable for their more pared-down style.

How to tell old from new

Look closely at the arch and the difference in style between the reliefs becomes clear:

  • The second-century works (spolia) feature well-proportioned, supple, naturalistic figures.
  • The fourth-century reliefs (Constantinian) have smaller, frontal, more "schematic" figures, typical of late antique art.

This contrast, once read as "decline," is today appreciated as a new artistic language — one that prizes the clarity of the message.

Why they matter

The spolia of the Arch of Constantine are essential to art historians: in a single place they let you trace the evolution of Roman sculpture, and they reveal how Rome — even through reuse — built its own memory and its own imperial identity.

Frequently asked questions

What are the spolia of the Arch of Constantine? Reliefs and sculptures taken from older monuments (of Trajan, Hadrian and Marcus Aurelius) and reused on the arch, alongside new fourth-century reliefs.

Why were they reused? To tie Constantine to the great emperors of the past, for their exceptional quality, and to finish the monument quickly: practical and symbolic reasons at once.

Which emperors do they come from? From monuments of Trajan (the Dacian frieze, the statues of the Dacians), Hadrian (the hunting roundels) and Marcus Aurelius (the attic panels).

How do you tell the ancient reliefs from the new ones? The second-century reliefs are naturalistic and well-proportioned; the fourth-century Constantinian ones are smaller, frontal and schematic, typical of late antique art.

Why are the spolia important to scholars? Because a single monument lets them compare three centuries of Roman sculpture and understand how Rome built its imperial memory.

See also

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Article #528 · Category: Monuments · Updated: May 2026