Antonopoulos was born Ioannis Antonopoulos on January 1, 1952, in
Marousi, Greece. He attended the School of Theology at the
University of Athens; after his military service he was tonsured a monk and ordained a deacon in 1976. In 1977 he resided at the Holy Monastery of the Transfiguration near
Thebes, Greece. In 1983 he was ordained a presbyter and served under the
Metropolis of Thebes and Livadeia as a preacher and head of the youth department. In 1991, he replaced the abbot of the Holy Monastery of Transfiguration, Archimandrite Nicodemus Badaloukas, due to the former resigning due to illness. Antonopoulos was elected on 18 October 2013 by the Hierarchy of the Church of Greece as Metropolitan of Argolis; he was enthroned on 24 November 2013, at the Metropolitan Church of Saint George in
Nafplio. That same year he was awarded the
Order of Merit of Ukraine in the third degree. ==Awards and honors==