What is a “thebaid”? Per the Catholic Encyclopaedia,
The valley of the Nile, under Roman domination, was divided into four provinces: Lower and Upper Egypt, Lower and Upper Thebaid. The last two comprised the upper part of the valley. During the fourth to fifth centuries it was the chosen land of the monks, who by their sanctity and by the form they impressed on the monastic system greatly influenced the East and the West.
A thousand years after this initial flowering of Christian monasticism in the Egyptian Thebaid, there was already flourishing in Russia a “Northern Thebaid,” and in the mid-1970s, St Herman of Alaska Press of Platina, California, published a collection of the lives of many of the great Russian ascetics in a book bearing that title. The book’s description reads: