Placidia was the wife of Olybrius, Western Roman Emperor. Her full name is uncertain. The Chronicle of the Roman Emperors: The reign by reign record of the rulers of Imperial Rome (1995) by Chris Scarre gives her name as Galla Placidia Valentiniana or Galla Placidia the Younger, based on Roman naming conventions for females.
Read more about Placidia: Family, Marriage, Vandal Captivity, Life in Constantinople, Empress