 Odaenathus  is the Roman version of the king 's name who was born Lucius Septimius Udaynath c . 220 AD . " Udaynath " is the king 's personal name , an Arabic name that mean " little ear " . " Septimius " was the family 's gentilicium ( surname ) adopted as an expression of loyalty to the Roman Severan dynasty , whose emperor Septimius Severus granted the family Roman citizenship in the late second century .