 What is known of Tullia's life is from Plutarch's account of Cicero and the letters that Cicero wrote to others, particularly to her mother, and to his friend, the eques Titus Pomponius Atticus.In 66 BC, Tullia was betrothed to Gaius Calpurnius Piso Frugi.They were married in 63, when Tullia was fifteen or sixteen, and Piso not much older.