Scholar of Church Law
Gromoglasov was born in 1869 in the village of Ermish' in Tambov Province, the son of a deacon serving a rural church. He passed through the Shatsk and Tambov theological seminaries and in 1893 completed a Candidate of Theology degree at the Moscow Theological Academy, where his thesis on the marriage of converts from the schism was singled out for an award.
His scholarly work centered on ecclesiastical law and the history of the Old Believer schism. He held a professorial stipend at the Moscow Academy's chair of canon law, lectured on Old Believer history at the Penza Theological Seminary, and served as a docent and later extraordinary professor at the Moscow Academy. In 1908 he defended a master's dissertation on the definitions of marriage in the Kormchaya, the Slavonic book of church law, and was awarded the Metropolitan Macarius Prize. From 1916 he also taught church law in the law faculty of Moscow University.
He took part in all three sessions of the Local Council of the Russian Orthodox Church of 1917–1918, the council that restored the Moscow patriarchate, where he sat on several departments, was elected to the Higher Church Council, and argued for lay participation and conciliar governance.