Editing Nicephorus Gregoras (section)

== Life ==
Gregoras was born at [[Heraclea Pontica]], where he was raised and educated by his uncle, John, who was the Bishop of Heraclea.<ref>[http://adsabs.harvard.edu/full/2006POBeo..80..269T Theodossiou, E. T., Manimanis, V. N., Dimitrijevic, M. S., & Danezis, E., The Greatest Byzantine Astronomer Nicephoros Gregoras and Serbs, Publications of the Astronomical Observatory of Belgrade, Vol. 80, p. 269-274, 2006]</ref> At an early age he settled at [[Constantinople]], where his uncle introduced him to [[Andronicus II Palaeologus]], by whom he was appointed ''[[chartophylax]]'' (keeper of the archives). In 1326 Gregoras proposed (in a treatise which remains in existence) certain reforms in the calendar, which the emperor refused to carry out for fear of disturbances; over two hundred years later they were introduced by [[Pope Gregory XIII|Gregory XIII]] on almost the same lines.{{sfn|Chisholm|1911}}

=== Downfall of Andronicus II ===
When Andronicus was dethroned (1328) by his grandson [[Andronicus III Palaeologus]], Gregoras shared his downfall and retired into private life. Attacked by [[Barlaam of Calabria]], he was with difficulty persuaded to come forward and meet him in a war of words, in which Barlaam was bested. This greatly enhanced his reputation and brought him a large number of pupils.{{sfn|Chisholm|1911}}

Gregoras remained loyal until the death of the elder Andronicus. Thereafter he succeeded in gaining the favour of Andronicus III, who appointed him to conduct negotiations for a union of the Greek and Latin churches with the ambassadors of [[Pope John XXII]]. The negotiations, which took place in 1333, failed to achieve a resolution.{{sfn|Chisholm|1911}}

=== Hesychast controversy ===
Beginning in 1346, Gregoras took an important part in the [[Hesychast controversy]] at the encouragement of the Empress [[Anna of Savoy|Anna]], by publishing a tract in which he staunchly opposed [[Gregorius Palamas]], the chief supporter of the doctrine. Although he persuaded some prominent churchmen, such as [[Joseph of Ganos]] and [[Arsenios of Tyre]], his opinion was opposed to those of Emperor [[John VI Cantacuzene]]. Although he presented his views at length at the synod of 1351, that synod declared his views heretical and the doctrines of Palamas orthodox. He and other dissidents were given the opportunity to recant, and he refused.<ref>Donald M. Nicol, ''The Last Centuries of Byzantium, 1261-1453'', second edition (Cambridge: University Press, 1993), pp. 232f</ref> He was then practically imprisoned in a monastery for two years.{{sfn|Chisholm|1911}}

=== Campaign against doctrine of Gregorius Palamas ===
Although the doctrine of Gregorius Palamas came to be accepted by the majority of the Orthodox Church, Gregoras persisted in campaigning against what he considered a heretical doctrine forced upon the Church by a robber council. He became a monk and devoted himself to campaigning against the Palamites, destroying his friendship with John Cantacuzene. He was first placed under house arrest, then confined to the [[Chora Monastery]]. When he was released from the monastery in 1354, Gregoras returned to his preaching and denunciations. Gregoras devotes two of the 37 books of his ''Roman History'' on his objections to the doctrine of Palamas; according to Donald Nicol, "It is disappointing that Gregoras the philosopher and historian should have degenerated into a ranting polemicist in his declining years."<ref>Nicol, ''Last Centuries'', p. 234</ref>

=== Astronomy ===

Gregoras is known to have predicted with exactitude a total solar eclipse on 16 July 1330 <ref>https://eclipse.gsfc.nasa.gov/5MCSEmap/1301-1400/1330-07-16.gif</ref> using the [[Handy Tables]] and [[Almagest]] from [[Ptolemy]]<ref>J. Mogenet, A. Tihon, R. Royez, A. Berg, ''Nicéphore Grégoras - Calcul de l’éclipse de soleil du 16 juillet 1330'', Corpus des astronomes byzantins, I, Gleben, 1983, Introduction, p. 11 {{ISBN|978-9070265342}}.</ref> and thus since Antiquity.