The Monastery of St.Varlaam or All Saints is one of the active monasteries of Meteora. It is believed that the monastery received its name from the monk Varlaam, the first settler who climbed the rock in the first half of the 14th century and built a small temple dedicated to the Three Hierarchs. It is also known that the monk Varlaam was a contemporary of St. Athanasius of Meteora, who founded the Megala Meteora Monastery.
The Great Meteoron Monastery or the Megala Meteora Monastery is a monastery in honor of the Transfiguration of the Lord in Greece, the largest and oldest Orthodox monastery among the Meteoron, founded in the early 14th century by the monk Athanasios on one of the Meteoron rocks in Thessaly, near the village of Kastrakion. In 1988, the Great Meteoron Monastery, along with other Meteoron monasteries, was included in the list of UNESCO World Heritage Sites in Greece.