According to tradition, the structure became a church around 330, under Emperor Constantine I, when the basilicas of numerous house churches came to be adapted for liturgical use. The basilica was T-shaped with a central nave with twelve columns on each side, flanked by side aisles. All that is left of these two side aisles, after the late 16th-century rebuilding, are the two side chapels of the basilica church. In the Synod of 565, the church is first referred to as the title of Susanna; the church has been dedicated to her veneration ever since. In the acta, Susanna is martyred with her family when the girl refuses to marry the son of Emperor Diocletian; the occasion of Susanna's martyrdom is a literary trope that is familiar in other "passions" of virgins in the Roman Martyrology[4]