（Ἰωάννης ὁ Γλύκις
), or perhaps also GLYCAS (Γλυκᾶς
), patriarch of Constantinople from 1316 to 1320, was a scholar of great learning, and renowned for his oratorical attainments.
He was the teacher of Nicephorus Gregoras, the historian, who speaks of him with great praise in several passages of his History. Glycis resigned his office, worn out by age, sickness, and labour, and retired to the convent of Cynotissa, living there upon a small sum of money, which was all that he had reserved for himself out of his extensive property.
Glycis wrote in a superior style, and endeavoured to purify the Greek language from those barbarisms with which it was then crowded.
He was not only distinguished as a scholar and divine, but also as a statesman.
The emperor sent him as ambassador to Rome, and Glycis wrote an account of his journey thither, of which Nicephorus Gregoras speaks with great praise, but which is unfortunately lost. His other works are, a Greek grammar, extant in MS. in various libraries, entitled Περὶ Ὀρθότητος Συντάξεως
He has also left some minor productions; such as Ἡ παραίτησις τοῦ Πατριαρχείου
, in which he explains the motives that induced him to resign the patriarchate, and Ὑπομνηστικὸν εἰς τὸν βασιλέα τὸν ἅγιον
, an admonition to the holy emperor, viz. Michael Palaeologus, extant in MSS. in the Royal Library in Paris. (Wharton's Appendix to Cave's Hist. Lit.
p. 21, ad an. 1316; Fabric. Bibl. Graec.
vol. xi. p. 520; Jahn, Anecd. Graeca,
Praef. p. 1.)