One of the largest

baths in

Lusitania, built between the late 1^st century AD and the first decades of the 2^nd century AD. There were hot, cold and tepid

baths, a furnace, a

palestra, a corridor and two cloacae, in addition to -it is thought- a dressing room. A large room in the building's northwest corner was later used as a home, in the late 5^th century to mid-6^th century.
These

baths were identified for the first time in 1771, during the city's Pombaline reconstruction. At the time, an inscription was discovered, dated to the year 336 AD (when the building would have been submitted to reformulation work), that revealed the name of the public

baths: Thermae Cassiorum, or

Baths of the Cassii - one of the city's most notable families. Archaeological excavations held between 1991 and 1998, and again in 2013, revealed parts of the complex unknown until then.