C. S. Clarus, equestrian. Plinius  the Younger dedicated the first book of his letters (Plin. Ep. 1,1) and Suetonius his book De vita Caesarum (cf. Lydus, Mag. 2,6) to him. C. AD 120-122 praef. praet. of Hadrian beside Marcius [II 14] Turbo. According to an account in Historia Augusta (SHA Hadr. 11,3), he and Suetonius overstepped the boundaries of court etiquette with respect to the emperor's wife Sabina. Dismissed, therefore, from his post, presumably while he and Hadrian were staying in Britain.
Syme, RP 3, 1283-1285.