Aqua Marcia
The Aqua Antoniniana was a side branche of the Aqua Marcia, partly outside the Aurelian wall, to the baths of Caracalla (FUR 41). Just behind the Porta Appia (the present Porta San Sebastiano) it crossed the Via Appia. This aqueduct arch was called "Arch of Drusus". (R. Lanciani: Forma Urbis Roma 46 Porta San Sebastiano)