Saint Philotheos Kokkinos, Patriarch of Constantinople, defender of the hesychasts.
Philotheos was born in Thessalonica and became a monk on Mount Athos, where he was abbot of the Great Lavra and a close friend of Saint Gregory Palamas. He served as Metropolitan of Heraclea and twice as Patriarch of Constantinople in the fourteenth century.
He presided over the council that confirmed the teaching of Palamas, composed his life and service, and wrote many hymns and theological works before reposing around 1379.
Feast day
On the New Calendar, Philotheos Kokkinos is commemorated on October 11. Churches on the Old (Julian) Calendar keep the feast on October 24 of the civil calendar.
Also commemorated on October 11

Fathers of the Seventh Ecumenical Council
Saint, Ζ' Οικουμενική Σύνοδος
Commemoration of the Holy Fathers of the Seventh Ecumenical Council at Nicaea, which upheld the veneration of the holy icons.
Theophanes the Branded
Hierarch, Θεοφάνης ο Γραπτός
Saint Theophanes the Confessor and Hymnographer, Bishop of Nicaea, called the Branded.
Name days: Theophanis, Theofanis, Theophanes, Fanis, Phanis
Nektarios, Arsakios and Sisinios of Constantinople
Hierarch, Νεκτάριος, Αρσάκιος και Σισίνιος
Saints Nektarios, Arsakios and Sisinios, Patriarchs of Constantinople.
Zenaida and Philonilla
Holy Woman, Ζηναΐδα και Φιλονίλλα
Holy Women Zenaida and Philonilla of Tarsus, physicians and kinswomen of the Apostle Paul.
Name days: Zenaida, Zinaida, Zina, Zenais, Philonilla
Jonas of Pergamos
Venerable, Ιωνάς ο εν Περγάμω
Venerable Jonas of Pergamos in Cyprus, disciple of Saint John Lampadistis.