Blessed John of Ustiug (died 1494) was a fool-for-Christ venerated in the region of Veliky Ustiug in northern Rus'. According to his Life, written down in 1554 from firsthand accounts, he was born in the village of Pukhovo near Old Ustiug to pious parents, Savva and Maria; his mother later entered monastic life as the nun Natalia at the Holy Trinity Monastery in Orlets.
From childhood John kept a severe regimen of fasting — eating nothing on Wednesdays and Fridays, and otherwise taking only bread and water — before adopting the ascetic path of folly for Christ. He lived in a hut, passed his nights in prayer, and wandered barefoot and in rags through the streets of Ustiug throughout the year, at times resting on a dung heap or on hot coals while concealing his prayer beneath the appearance of madness.
He reposed at a young age on May 29, 1494, and was buried near the Dormition Cathedral in Ustiug, where a church was later built over his relics. His Life records that he was granted the gift of wonderworking even during his lifetime, and he came to be venerated as an intercessor in times of enemy invasion and as a healer of various ailments.
