In the late-Byzantine period, the entrance to the Monastery was relocated to the position it occupies today. It is likely that the ground-level section of the tower of St Stefanos was built at the end of the 15th century.
In total, the tower has three levels, with wooden floors and a wooden roof, but the height of the ground-level section is much higher, equivalent to about two storeys. In that section, there were two gates, each with doors, so that to enter the Monastery, one had to pass through three successive gates. The chapel of St Stefanos is located on the third floor of the tower.
