The central section of the gable on the back wall, where once was the fortress attacked by the knights, is almost completely covered by a fresco by the same Grixopulo, as is indicated by writing on the right: “Grixopulus fecit hoc opus”. There is indeed a second signature of the painter himself on the same wall. This has lead some to suppose that at a certain moment in the history of the building the hall must have been divided horizontally into two separate parts.