Schola Castra Nova Equitum Singularium

The Schola of the Castra Nova Equitum Singularium was a meeting room/office of the curatores from the mounted bodyguard of the Emperor found within the remains of the headquarters of the Castra Nova ('New Camp') beneath the Basilica San Giovanni in Laterano. == Excavations == Archaeological excavations beneath San Giovanni in Laterano in 1934–1938 uncovered part of the principia of the castra nova (new fort) of the Equites singulares Augusti.

Source: Wikipedia — Schola Castra Nova Equitum Singularium (CC BY-SA 4.0)