The Roman villa of the Walls of St. Stephen is located in Anguillara Sabazia along the Via Clodia was built at the end of the 2nd century AD, in which are found the remains of a three-storey building, about 18 metres high, of brick-lined concrete.
There are arched openings outside, and inside the building there is a central courtyard. The lateral corridors retains traces of marble coating on the walls. A cistern is still nearby.
In medieval times it was a domusculta, a papal farm estate, and in the 9th century it was used as a church devoted to Santo Stefano, of which there is an apse built in unusually regular ‘opera listata’.
In the mid-nineteenth century the structure was used as a cemetery in conjunction with malaria epidemics.