File:Escalier.romain.png

...L'escalier romain le plus ordinaire est ainsi disposé (1). Il se compose de deux rampes séparées par un mur de refend, la première arrivant à un palier d'entresol A, la seconde au palier de premier étage B, et ainsi de suite. Les marches sont alors portées sur les voûtes rampantes, si les degrés sont très-larges, ou simplement engagées par les deux bouts dans les murs, si ces degrés sont étroits...

This image comes from Dictionary of French Architecture from 11th to 16th Century (1856) by Eugène Viollet-le-Duc (1814-1879).

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