In the early 4th century (Phase III), the villa was transformed into an elite dwelling enclosing the courtyard. The existing wings were linked by a covered portico, and an inner garden and outer courtyard were created. The dining-room ("triclinium") received its mosaics and the northern half of the west wing was converted to become a second set of baths. Shortly afterwards (Phase IIIA) the baths in the north wing were rebuilt and changed to dry-heat ("laconicum") baths, which meant that the villa had both damp-heat and dry-heat bathing suites. The floors of at least 15 rooms were decorated with mosaics. In the late 4th century (Phase IV) the north wing was extended with the addition of a new dining-room.