Ioseph 20 was hegoumenos of the Monastery "ton Kerameon" (τῶν Κεραμέων); addressee of a letter from Theodore the Stoudite (Theodoros 15), written in 826 on the death of their bishop Petros (Petros 49, bishop of Nikaia), by whom Ioseph 20 had been appointed hegoumenos; he is alluded to as ὁ κύριος ὁ ἡγούμενος (p. 823, line 57) and σοί τῷ κυρίῳ καθηγεμόνι (p. 822, lines 36-37): Theod. Stud., Ep. 544, pp. 821-823 (addressed Ἰωσὴφ καθηγουμένῳ τῶν Κεραμέων), and cf. also Gregorios 146 (one of his monks). During the iconoclast persecution under Leo V (Leo 15) Ioseph 20 had at first lapsed but quickly changed his mind and gave his support to the veneration of icons, for which he was applauded by Theodoros 15: Theod. Stud., Ep. 73, pp. 193-194 line 24; Ep. 74, pp. 194-195 line 32; Ep. 91, p. 212 line 10; Ep. 151, pp. 269-270 line 44 (all written in c. 816).

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