Defense of the Holy Icons
According to the synaxarion, Paul's defense of the veneration of icons rested upon Holy Scripture, from which he drew his arguments against the iconoclasts who at that time raged against the Church of Christ.
He endured harassment and persecution together with Saint Theophylactus, who is commemorated the following day, March 8. Paul was sent into exile for his stand and is therefore numbered among the confessors rather than the martyrs.
Historical Context
Paul lived during the second period of Byzantine iconoclasm, which was renewed under the Emperor Leo V the Armenian and lasted from 813 to 843. Orthodox bishops who publicly defended the veneration of icons during this period were subject to exile, imprisonment, and physical persecution.
The controversy ended in 843 with the Triumph of Orthodoxy, commemorated on the first Sunday of Great Lent, after which confessor bishops who had survived exile were restored. Since Paul is recorded as having reposed around 850, he likely lived to see the Triumph of Orthodoxy in 843 before dying a few years later.
The troparion appointed for Saint Paul, in Tone 8, hails him as a champion of Orthodoxy, a teacher of purity and true worship, and an adornment of hierarchs. This troparion is one normally reserved for the great hierarchs of the Church, reflecting his high standing as a defender of Orthodox teaching during the iconoclast persecution.
Sources and Documentation
Paul of Plousias is a genuinely obscure figure with minimal documentation outside the synaxarion entry. He is listed among the saints commemorated on March 7, and no dedicated article on him exists in standard online reference works such as OrthodoxWiki.