I Legio Martia Victrix: The Praetorian Guard
The Legio's colors are midnight blue and dark gray with red and white trim.
Per FM:Periphery, page 77.
Gladius, FM: Periphery (color plate 4)
Their insignia is a dark gray fasces with a red axe-blade and midnight-blue bands. Per FM:Periphery, page 77.