Biographical details on Ioane-Zosime are scarce beyond the fact that he was one of the numerous expatriate Georgian clerics active at the monastery of Mar Saba in Palestine from where he moved, probably fleeing the Arab rule, to Mount Sinai early in the 970s. His voluminous body of work dates from between 949 and 987. Of the three surviving manuscripts of Ioane-Zosime's Mar-Saba period, two - the collections of hymns of 949 and 954 - are the most important. On Mt. Sinai, Ioane-Zosime principally engaged in bookbinding, collating and copying. In his hymnographic compilations and chronologic treatises, Ioane-Zosime provides a detailed list of sources as well as an encyclopedically organized calendar of saint's feast days and the chronology of the Georgian liturgy. He also collected obsolete texts which he frequently cites, comparing usage in different ecclesiastical centers and distinguishing Georgian from Greek sources. One of his anthologies of chants ends with Ioane-Zosime's testament written as an elaborate acrostic hymn in which reading the first and last letter of each stanza gives us the name of St. George.