Soon after, in 125, Hadrian appointed Quintus Marcius Turbo as his Praetorian Prefect. Turbo was his close friend, a leading figure of the equestrian order, a senior court judge and a procurator. As Hadrian also forbade equestrians to try cases against senators, the Senate retained full legal authority over its members; it also remained the highest court of appeal, and formal appeals to the emperor regarding its decisions were forbidden. If this was an attempt to repair the damage done by Attianus, with or without Hadrian's full knowledge, it was not enough; Hadrian's reputation and relationship with his Senate were irredeemably soured, for the rest of his reign. Some sources describe Hadrian's occasional recourse to a network of informers, the "frumentarii" to discreetly investigate persons of high social standing, including senators and his close friends.