Quintus Petronius Didius Severus
Severus was of the gens Petronia. His father was Quintus Petronius Severus, born c. 70, was a distinguished General and had a sister named Petronia Vara, born c. 75. His mother was Didia Jucunda, of the gens Didia, thus explaining the use of both gentile names in his own, as became the custom around this time. His paternal grandfather Quintus Petronius, son of one Gaius Petronius, was an Insuber or Insubrian in the city. His grandfather, father, aunt and Severus himself were born and raised in Mediolanensis.
- Didius Proculus, married, his son was betrothed to his niece Didia Clara.
- Didius Nummius Albinus
- Marcus Didius Severus Julianus, 137, best known as Didius Julianus, briefly Roman Emperor in 193.
- Augustan History - Didius Julianus