Igumen of the Lavra
As superior of the lavra, Theoctistus received all who came to him, hearing their confessions and guiding them in the ascetic life. The division of labor between the two friends became settled: Euthymius preferred the stillness of seclusion, while Theoctistus governed the growing brotherhood and tended to the spiritual needs of those who sought the monastery.
The community lay in the Judean Desert in the Wadi Mukellik (Nahal Og), near the principal monastery later associated with Euthymius himself. The tradition holds that Theoctistus died at an advanced age; by the account preserved in the synaxarion, the aged Euthymius cared for him in his final illness, and the Patriarch of Jerusalem presided at his burial.