Palaiokastro was fortified in antiquity, probably in the late 4th century, or the early 3rd. Although we have no information about this place in the centuries that followed, surface finds in the wider region reveal an enduring human presence on the spot.
The earliest mention of the village is located in the Frankish period of rule, in the Chronicle of the Morea. At that time, in the years 1263-1264, in the area of the Alpheus, the Franks clashed with Byzantines of the Despotate of Mystra, like at Prinitsa. In the course of this campaign, as we are informed by the Chronicle of the Morea (f. 4859, 5205), the Franks stopped in Servia before proceeding to Vlyziri. The identification of Servia, which is referred only in the Greek text and does not then re-appear in a text until after the 13th century, has puzzled researchers: some have identified it with the settlement at Servos, while others believed, incorrectly, that it is the same place as Seryiana, which is also reported in the Chronicle of Morea.
The name Servos (Servù) is detected also in the list of the Venetian census of Grimani in 1700. In addition, it is included as Seruir in the lists of the Peloponnese villages which Antonio Pacifico mentions as being in the Venetian control in the same year.
During the Ottoman rule, the settlement belonged to the vilayet of Karytaina. However, the castle itself at that time seems to have been abandoned and gradually its material was used by the villagers for the needs of their settlement.
Χρονολόγηση: Frankish/Late Byzantine periods (13th-15th centuries)
