Late Byzantine in the context of "Nicaean Empire"

Georgios Gemistos Plethon (Greek: Γεώργιος Γεμιστὸς Πλήθων; Latin: Georgius Gemistus Pletho c. 1355/1360 – 1452/1454), commonly known as Gemistos Plethon, was a Greek scholar and one of the most renowned philosophers of the Late Byzantine era. He was a chief pioneer of the revival of Greek scholarship in Western Europe. As revealed in his last literary work, the Nomoi or Book of Laws, which he circulated only among close friends, he rejected Christianity in favour of a return to the worship of the classical Hellenic gods, mixed with ancient wisdom based on Zoroaster and the Magi.

In 1438–1439 he reintroduced Plato's ideas to Western Europe during the Council of Florence, in a failed attempt to reconcile the East–West schism. Plethon also formulated his political vision in several speeches throughout his life. The boast in one of the speeches that "We are Hellenes by race and culture" and his proposal of a reborn Byzantine Empire following a utopian Hellenic system of government centered in Mystras, have generated discussion about Byzantine and modern Greek identity. In this regard, Plethon has been labelled both "the last Hellene" and "the first modern Greek".

Gregory Palamas (/pæləˈmɑːs/; Byzantine Greek: Γρηγόριος Παλαμᾶς, romanized: Grēgórios Palamâs, pronounced [ɣriˈɣo.ri.os pa.laˈmas]; c. 1296 – 14 November 1359) was a Byzantine Greek theologian and Eastern Orthodox cleric of the late Byzantine period. A monk of Mount Athos (modern Greece) and later archbishop of Thessalonica, he is famous for his defense of hesychast spirituality, the uncreated character of the light of the Transfiguration, and the distinction between God's essence and energies (i.e., the divine will, divine grace, etc.). His teaching unfolded over the course of three major controversies, (1) with the Italo-Greek Barlaam between 1336 and 1341, (2) with the monk Gregory Akindynos between 1341 and 1347, and (3) with the philosopher Gregoras, from 1348 to 1355. His theological contributions are sometimes referred to as Palamism, and his followers as Palamites.

Gregory has been venerated as a saint in the Eastern Orthodox Church since 1368. Within the Post Vatican II Catholic Church, he has also been called a saint; Pope John Paul II repeatedly called Gregory a great theological writer. Since 1971, the Melkite Greek Catholic Church has venerated Gregory as a saint. Some of his writings are collected in the Philokalia, and since the Ottoman period, the second Sunday of Great Lent is dedicated to the memory of Gregory Palamas in most branches of the Eastern Orthodoxy, while in some Eastern Catholic Churches, the issue is disputed.