PROCLUS, St. — Bishop of Constantinople, d. 446; in 426 he was appointed bishop of Cyzicus but had to remain in Constantinople due to the refusal of his diocesans.
Between 428-30 he rose from the pulpit against the bishop of Constantinople, Nestorius, who railed against the title *Theotokos* attributed to the Madonna. Having become bishop of Constantinople in 434, P. worked to maintain the concord between the Antiochenes and the orthodox achieved in 433, smoothed the path to union for the “Ioannites” (cult or preservation of the memory of Chrysostom), and informed the Armenians about the errors contained in the books of Theodore of Mopsuestia. P. introduced the Trisagion into the liturgy and is the author of the formula “One of the Trinity was crucified,” around which controversy arose in the 6th century over the Monophysite sense that some wished to impose upon II.
P., an elegant orator reminiscent of Chrysostom, left about forty homilies (the 5th seems rather to be by Atticus) important for their Mariological content, and seven letters, including the *Tomus ad Armenos*. Whether P. is also the author of some eighty pseudochrysostomic sermons, as B. Marx maintains, remains doubtful. Feast: 24 Nov.