Castra Nova equitum singularium
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The Castra Nova equitum singularium was an ancient Roman fort in Rome housing part of the emperor's cavalry bodyguard. The site of the fort now lies beneath the Basilica of St John Lateran. The Castra Nova, or "new fort", was one of two cavalry forts that provided a base in Rome for the mounted bodyguard of the Roman emperors (the Equites singulares Augusti).
The Castra Nova was so-called because it was the newer of the two forts, built to house an enlargement of the cavalry guard. Their previous fort Castra Prioria which lay not far away to the north[1] had been built earlier, possibly under the emperor Domitian, and still housed the original force of 1500 mounted troopers. The full name of the fort is Castra nova Equitum singularium Augusti.