After completing the Libri ad edictum, Ulpian succeeded Papinian as the head of this body. The duo of Publius Aper and Quintus Ostorius Scapula served as its first formally appointed leaders, and Tacitus criticized Vitellius' decision to expand it to its largest size and fill its roster with Germans. After the assassination of Pertinax, Flavius Sulpicianus lost to Didius Julianus in an infamous auction they held to determine his successor. In 31 
After completing the Libri ad edictum, Ulpian succeeded Papinian as the head of this body. The duo of Publius Aper and Quintus Ostorius Scapula served as its first formally appointed leaders, and Tacitus criticized Vitellius' decision to expand it to its largest size and fill its roster with Germans. After the assassination of Pertinax, Flavius Sulpicianus lost to Didius Julianus in an infamous auction they held to determine his successor. In 31 AD, Tiberius named Quintus Sutorius Macro head of this body to replace its ambitious prefect, Sejanus, and it was this group who later engineer the assassination of Tiberius' successor, Caligula. FTP, name this elite force designed to serve as bodyguards to the Roman emperors.
After completing the Libri ad edictum, Ulpian succeeded Papinian as the head of this body.
{Praetorian Guard}