Stephen the Younger was an 8th-century Byzantine monk from Constantinople who became a primary opponent of the iconoclastic policies implemented by Emperor Constantine V. Born around 713, he entered monastic life at Mount Auxentius and eventually established his own monastery. His resistance to the decisions of the Council of Hieria led to intense persecution, including accusations of misconduct and eventual exile. He was ultimately executed in 764, becoming a significant martyr for the cause of icon veneration.