The tower Π3 is located about 75m. east of the main gate, it is semicircular, its diameter is about 5m. and it is 1.6m thick. Its structure consists of the main torso and the defense parapet. This construction has been filled with soil and other materials that reach the level of its floor and two types of masonry are distinguished on its facades. An engraved inscription is incorporated approximately in the middle of the facade of the tower, which has been studied by researchers from time to time.
At the first attempt for analysis by the scholar Theocharis Tsoutsinos (1993), it was suggested that the engraved inscription bears the letters M.A.D.K. and interpreted as Michael Angelos Komnenos Doukas, obviously indicating the ruler who repaired and enhanced the Castle. Nevertheless, this opinion was not sufficiently documented and is not widely accepted.
According to a newest suggestion, made by Professor G. Velenis, the inscription bears the Byzantine date 6878, which refers to the years 1369-70 AD. Also, the name Ioannis is distinguished, without knowing whether this refers to a historical figure or not. Until today, this is the most acceptable explanation of the inscription.