Georgius Chrysococces (gr. Georgios o Chrusokokkes), was a learned Greek physician, who lived in the middle of the fourteenth century of the Christian aera, and wrote several valuable works on astronomy and mathematics. It would seem that Georgius Chrysococces is identical with Chrysococces the friend of Theodore Gaza, both of whom were employed for some time in the library of the Vatican, and saved several valuable Greek MSS. from oblivion or destruction. None of the works of Chrysococces have been printed, although their publication would apparently be a valuable acquisition to the history of astronomy. His principal works extant in MS. are: Exegesis eis ten suntaxin ton Person en kephalaiois mz', syn tois Astronomikois diagrammasi kai Geographikois pinaxin,"Expositio in Constructionem Persarum per Capita 47, cum Astronomicis Designationibus, et Geographicis Tabulis," in the Bibl. Ambrosiana. It seems that this work is the same which we find in the Royal Library at Paris, under the title Georgiou tou Chrusokokke tou iatrou Astronomika. There is another Codex in the same library, intitled Georgion iatrou tou Chrusokokke peri tes heureseos tes hemeras tes haplôs suxugias heliou kai selenes, De inveniendis Syzygiis Lunae solaribus per singulos Anni Menses." In the Royal Library at Madrid is Pws dei kataskeuazein Oroskopon, htoi Astrolabon," Quomodo construendum sit Horoscopium, aut Astrolabium." A codex in the Ambrosian Library, inscribed Ekdosis eis to ioudaïkon Exapterugon, "Editio et Expositio Syntagmatis Canonum Astronomicorum Judaicorum," is attributed to Georgius Chrysococces, who has also left a MS. of Homer's Odyssey, written and accompanied with scholia by himself, in the year of the world 6844 (1336 AD), as it is said in the copy of this work which was formerly in the Bibl. Palatina at Heidelberg, whence it was sent to Rome by the Spaniards, and kept in the Vatican library till 1815, when it was sent back to Heidelberg with the rest of the Palatine library by order of pope Pius VII. It is doubtful if Georgius Chrysococces is the same Chrysococces who wrote a history of the Byzantine empire, of which a fragment on the murder of sultan Mürad I. in A. D. 1389 is given by Fabricius. The complete astronomical works of Chrysococces, as stated above, have not been published, but several of his Astronomical and Geographical tables have been inserted in various modern works on Astronomy and Geography. (Fabric. Bibl. Graec. xii. pp. 54 57.)

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