The Monastery lies at a short distance to the east of Athens, on a hillside at the foot of Mt. Hymettos among pins, maple trees and cypress trees.

It was founded in the Early Christian period and was dedicated to the Entry of the Virgin to the Temple. Remains of two successive basilicas, dated to the 6th and the 10th century, respectively, have been uncovered. The complex seen today was erected in the 11th century and remained in use during the Turkish occupation.

The monastery had a famous, rich library which was moved to the Metropolis of Athens and destroyed during the Uprising of 1821.

The interior of the church is decorated with wall paintings dated before 1700 while those in the narthex are a little earlier, dated to 1682 and made by Ioannes Hypatios, according to an inscription.

Excavations were conducted in 1958 on the hill to the south west of the monastery and revealed the ruins of a 6th-century basilica beneath the 10th-century basilica.