Ioann (John) Chernov was born on [[November 29]], 1878 in the town of Sudodga in Vladimir Province, Russia, into a family of [[clergy]]. Still a pre-school aged child, the family moved to the city of Vladimir. After attending the local church schools, Ioann attended the [[seminary]] in Vladimir from 1895 to 1899. After graduating from the seminary, he taught religion in his home district from 1899 to 1902.
In 1902, Ioann was [[ordination|ordained]] a [[deacon]] on [[April 28]] and a [[priest]] on [[May 5]]. After serving in a number of different [[parish]]es, Fr.
Iaonn entered the [[Moscow Theological Academy and Seminary|Moscow Theological Academy]] where he studied from 1909 to 1913. On [[November 3]], 1912, Fr. Ioann was [[tonsure]]d a [[monk]] by the Rector of the Academy, [[Archimandrite]] Feodor (Pozdeyevsky) and given the name Jeronim. In 1913, he received a Master of Divinity degree by the Moscow Theological Academy. In 1914, he entered the Kursk Monastery of the Sign and joined the Kursk Theological Seminary where he taught Sacred History. On [[October 9]], 1915, he was appointed inspector at the seminary, a position he held until the Kursk Seminary was closed by the Bolsheviks in 1919.
He was also appointed deputy [[abbot]] of the Kursk Znamensky [[Monastery]] at which the Holy [[Kursk Root Icon]] of the Mother of God (Kursk-Korennaya Icon) was kept. Fr. Jeronim was also secretary to Bishop Theophan (Gavrilov) of the Kursk-Oboyansk [[Diocese]]. Fr. Jeronim was elevated to the dignity of archimandrite in 1919.
In 1923, Archim. Jeronim moved to Palestine to administer the Russian Ecclesiastical Mission in Jerusalem for a year, but remained in Palestine serving as a priest until 1935. In 1935, he was invited the United States by Bp. [[Vitaly (Maximenko) of Jersey City|Vitaly (Maximenko)]] of Detroit. On [[August 18]], 1935, Archim. Jeronim was [[consecration of a bishop|consecrated]] to the [[episcopate]] as Bishop of Detroit and Cleveland. In 1936, during a period of co-operation between the Russian [[OCA|Diocese of North America and Canada]] and the Russian Orthodox Church Outside of Russia, Bp. Jeronim was named Bishop of Montreal and Eastern Canada a position he held until 1946. He returned to ROCOR after the two groups separated following the Seventh [[All-American Sobor]] of 1946 in Cleveland, Ohio.
sober, Bp. Jeronim was elevated to [[archbishop]] and appointed, by the ROCOR [[Synod]] of Bishops, the ruling hierarch of the Diocese of Detroit and Flint. Abp. Jeronim reposed on [[May 14]], 1957 in Detroit, Michigan, after which his diocese of four parishes was merged with the Diocese of Chicago and Cleveland.