Recluse
… gained permission from the Archbishop of Trier, or the 19th-century Russian monk, glorified as a saint by the Russian Orthodox Church, Theophan the Recluse.
Synonyms of recluse
adjective: solitary, lonely, secluded, lone, retired, retiring; noun: hermit, anchorite, solitary, eremite, anchoret; plural: hermits, anchorites, solitaries, eremites, anchorets; related terms: solitudinarian, troglodyte, hermit, solitary, lone hand, lone wolf, loner.