Allianoi is an ancient spa settlement, with remains dating predominantly from the Roman Empire period (2nd century AD) located near the city of Bergama (ancient Pergamon) in Turkey's İzmir Province. The site is at a distance of 18 kilometers to the northeast of Bergama, on the road to the neighboring town of İvrindi. Allianoi is directly inside the reservoir of the Yortanlı Dam, built by the Turkish State Hydraulic Works. After ongoing discussion in Turkey with regards to preserving Allianoi's ruins, the site was covered with sand and the dam was activated, resulting in Allianoi's complete inundation and destruction in February 2011.
One particularity of Allianoi is it being a very recent
historical discovery. It was mentioned only once in the 2nd century by
the orator and medicinal writer Aelius Aristides in his "Hieroi Logoi" (Sacred Tales)
(III.1), one of the key sources for the knowledge on the science of
healing as it was understood at that time. No other writer of antiquity
nor any epigraphic finding known had referred to Allianoi.
During the excavations conducted in the forest to the west of Allianoi, a vessel of the type known as Yortan (dating from the Early Bronze Age II) was found. On the hills of Çakmaktepe (Flint Hill) nearby, a high quantity of flintstones were found during surveys. Additionally, two stone axes were unearthed from an earth fill. These findings suggest some form of prehistoric settlement at or near Allianoi.
Because of the presence of hot springs, it is thought that there must have been a thermal bath complex already in the Hellenistic period, but probably at a smaller scale than the later Roman site. No architectural material was found in Allianoi belonging to this period apart from a few archaeological and numismatic clues.