The project concerns the ruins of the Holy Metochi of Osia Filothei in the area of Kalogreza of the Municipality of Marousi, the katholikon is today the only preserved building of the Holy Metohi and is characterised as a historical monument, dated to the 16th century. The object of the project is the maintenance, restoration and promotion of the Catholic Metohios Agia Filotheis in Marousi. Within the framework of the project, the following will be implemented: A) Full fixation and static restoration of the masonry and the vaulting of the monument with the use of grouts, grouts and tractors-pressors. b) Measures to protect the frescoes before and during the execution of the building works as well as maintenance-restoration and promotion of them in the context of the project. c) Excavation works in the interior of the katholikon as well as in the surrounding area with the supervision of EFA.