Flavia Domitilla (saint) – Flavia Domitilla, daughter of Domitilla the Younger by an unknown father, perhaps Quintus Petillius Cerialis, had the same name as her mother and her grandmother Domitilla the Elder. She was thus a granddaughter of Emperor Vespasian and a niece of Emperors Titus and Domitian. She married her cousin, the consul Titus Flavius Clemens, a grand-nephew of Vespasian, through his father Titus Flavius Sabinus (consul AD 69).

Flavia Domitilla (saint) – Wikipedia

https://en.wikipedia.org/wiki/Flavia_Domitilla_(saint)

Flavia Domitilla, daughter of Domitilla the Younger by an unknown father, perhaps Quintus Petillius Cerialis, had the same name as her mother and her grandmother Domitilla the Elder. She was thus a granddaughter of Emperor Vespasian and a niece of Emperors Titus and Domitian. She married her cousin, the consul Titus Flavius Clemens, a grand-nephew of Vespasian, through his father Titus Flavius Sabinus (consul AD 69).