From 1824 onwards, the Kaisariani monastery, according to the Greek Wikipedia, suffered wretched treatment and was used for animals. The monastery closed in 1833, under Bavarian rule, by a decree of Maurer, because fewer than six monks lived there.
The Philodasiki Union of Athens, together with the Archaeological Service, restored the monastery complex in the period 1952 to 1955.
The great earthquake of 1981 caused serious damage, mainly to the bath and the refectory. Restoration work was interrupted again by the earthquake of 1999.
Hymettus has been designated a protected area of the European Natura 2000 network.
We do not yet have verified sources for the 19th century quarries, the reforestation and the fires, so they are not written here.