Isaac I of Optina
Schema-archimandrite Isaac I of Optina (), or Ivan Ivanovich Antimonov before tonsure, was the superior of Optina Hermitage from 1862 to 1894. Elder Isaac is venerated as a saint in the Eastern Orthodox Church. References

Further reading 
 Belovidov, Agapitus (1995). Life of the Elder of Optina, Archimandrite Isaac Antimonov (in Russian). Optina Hermitage. Optina Elders
1810 births
1894 deaths
Russian saints of the Eastern Orthodox Church
19th-century Christian saints
19th-century births
Eastern Orthodox Christians
Eastern Orthodox monks
Christian abbots
Hegumens
Starets
Archimandrites