Marcia, daughter of Lucius Marcius Philippus, the stepdaughter of Atia Balba Caesonia, stepsister of Octavia the Younger and Octavian (later Augustus), and was the second wife of Marcus Porcius Cato Uticensis who he married following his divorce from Atilia for adultery. Marcia became the stepmother to his son Marcus Porcius Cato and his daughter Porcia Catonis, first the wife of Marcus Bibulus and later Marcus Junius Brutus.