Glycis, John (Ι᾿ωάννης ὁ Γλύκις), or perhaps Glycas (Γλυκᾶς), was patriarch' of Constantinople from 1316 to 1320. He was regarded as a man of great wisdom and oratorical skill. Nicephorus, who was his pupil, praised him greatly. At length, enfeebled by age and disease, Glycis resigned the dignity of patriarch, and retired to the monastery of Cynotissa. Being an elegant and correct writer, he attempted to purify the Greek language from the barbarisms with which it was surcharged. For mention of his works see Hoefer, Nouv. Biog. Generale, s.v.