Domitilla the Younger

Flavia Domitilla the Younger or Flavia Domitilla Minor (c. 45-c. 66) was the only daughter of the Roman Emperor Vespasian and Flavia Domitilla the Elder. Her elder brother was Titus, and her younger brother Domitian. At the age of fifteen, she was married to Quintus Petillius Cerialis, with whom she had a daughter, the later Christian saint Flavia Domitilla.

Domitilla died before Vespasian became emperor in 69. She was later deified by her younger brother Domitian, who also bestowed the honorific title of Augusta upon her.

Source :

https://en.wikipedia.org/wiki/Domitilla_the_Younger