Quietus had a brother called Gaius Avidius Nigrinus, had two nephews a younger Gaius Avidius Nigrinus and Titus Avidius Quietus and was a great paternal uncle to Roman Emperor Hadrian's daughter-in-law Avidia Plautia.
Quietus’ family were wealthy, distinguished and well connected politically from Faventia (modern Faenza, Italy) and he was born and raised in Faventia.
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