Trajan's Column: A War Carved into a Pillar
To commemorate the conquest of Dacia, Trajan raised a marble column nearly 40 metres tall, its shaft wound from bottom to top by a relief band some 200 metres long — a stone comic strip depicting in detail the marches, fort-building, battles, and triumphs of the two Dacian wars. It is both an artistic masterpiece and the most precious pictorial source for studying the Roman army. Its summit once bore a statue of Trajan; in the Middle Ages it was replaced with a statue of St Peter — the pillar of Roman glory, taken over into Christian Rome.