Foundation on the Ruza River
Leucius established the Dormition Monastery on the Ruza River, situated approximately thirty-two versts from Volokolamsk and two versts from the village of Seredo-Stratilatsk. His monastic lineage descended from Saint Paphnutius of Borovsk, and he is named among the associates of Saint Joseph of Volokolamsk, who founded his own celebrated monastery in the same region.