pipes) was possibly sponsored by Matidia the Younger (daughter of Matidia the Elder, a niece of Trajan), therefore it might have been known as balneum Matidiae. Almost Two dozen black-and-white and polychrome mosaics were recovered. While a number of them have been lost, several are now in the Vatican Museum. Bath South of Navalia Outside the traditional regions of Ostia, a small Late Antique bathhouse came to light during soundings done by the German Archaeological Institute in Rome. A set of hypocausts decorated with marble were recovered. Due to the size, it appears it was connected to a private domus, but further research is needed. A lead waterpipe, stamped with the name Clodius Celsinus Adelphius, Praefectus Urbi in 351 C.E. was recovered indicating that he built the bathhouse. List of Identified Baths Regio I Forum Baths Baths of Buticosus Baths of Mithras Small Baths (I, XIX, 5) Hadrianic Bath under Forum of Heroic Statue Regio II Baths of the Coachmen Baths of Neptune Baths under the Via dei Vigili (Baths of the Provinces) Regio III Baths of the Christian Basilica Maritime Baths Baths of the Seven Sages Baths of Trinacria Baths in Horrea III, XVII, 1 Regio IV Baths of the Lighthouse Byzantine Baths Baths IV, V, 6 Baths of the Six-Columns Baths of the Skeleton Baths of Silenus Porta Marina Baths Baths of Musiciolus Regio V Baths of the Philosopher Baths of the Jealous One Baths of the Swimmer Outside Regio Palazzo Imperiale Baths South of Navalia See also Ancient Roman bathing Thermae List of Roman public baths Ostia Antica References External links Ostia Antica Ostia Antica Archaeological sites in Lazio Ostia (ancient city) Ancient Roman buildings and structures in Italy Ostia (Rome)