After stealing a necklace from a statue of one of these people, Theodosius I's niece
After stealing a necklace from a statue of one of these people, Theodosius I's niece Serena was haunted by bad dreams. These people were responsible for making a type of flour called mola salsa. The Tarpeian Rock is named for one of these people who traitorously allowed the army of Titus Tatius to enter Rome. According to Plutarch, these people were punished by being sealed in a chamber near the Colline Gate with only limited food and water. The pontifex maximus appointed children aged six through ten to become these people for thirty years, during which they guarded the Palladium. By marrying Elagabalus, one of these people controversially violated their vow of chastity. For 10 points, name these priestesses who watched over a sacred fire.
After stealing a necklace from a statue of one of these people, Theodosius I's niece
Vestal Virgins [or Vestals; prompt on virgins or women] 