Learn: Sunday of St. Gregory Palamas - Greek Orthodox Archdiocese of America
On the Second Sunday of Lent the Orthodox Church commemorates our Holy Father Gregory Palamas, Archbishop of Thessalonica, the Wonderworker. The feast day of Saint Gregory Palamas is November 14, however, he is commemorated on this Sunday as the condemnation of his enemies and the vindication of his teachings by the Church in the 14th century was acclaimed as a second triumph of Orthodoxy.
Source: goarch.org