Byzantine years
There are Byzantine monasteries on the slopes of the mountain. At Kaisariani Monastery the present church was built around 1100, on a site that was already used for worship. Ruins of an early Christian basilica survive to the west, and a smaller church was built over it in the 10th or 11th century. The bathhouse of the complex is contemporary with the katholikon, like the bathhouses of Daphni Monastery.
The Monastery of Saint John the Hunter was founded, according to the sources, in the 12th century on the northernmost peak. The article on Hymettus says Kaisariani flourished in the 12th and 13th centuries. No other source we opened confirms this, and the 2nd-century foundation the same article gives is contradicted by the dedicated article on the monastery.
You will find more about each monastery in Monuments.
Where sources differ, the text says so.