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Books about Galesiotes:
Meletios ho Galesiotes (1230-1307), ho agnostos theologos, hosios, homologetes, logios, syngrapheus,: Viographia... by Theophilos N Simopoulos (1978)
Wiki information Galesiotes:
George Galesiotes was a high-ranking Byzantine official of the Patriarchate of Constantinople who studied under the tutelage of Manuel Holobolos. Upon becoming an official of the Patriarchate, Galesiotes was in charge of the sakellion of the Church...