A Stoudite monk, Kledonios 1 was the addressee of three letters from Theodore the Stoudite (Theodoros 15), written between 809 and 818: Theod. Stud., Epp. 187, pp. 310-311; 263, pp. 391-392; 326, pp. 467-468 (all addressed Κληδονίῳ τέκνῳ). He is also mentioned in two other letters of Theodoros 15, written in the same period: Theod. Stud., Epp. 40, pp. 115-120; 116, p. 235. In c. 809 he was imprisoned for supporting Theodoros 15 over the Moechian controversy; he was given a beating and yielded after only one day: Theod. Stud., Ep. 40, p. 120, line 166. Later, in 817, he wanted to enter the Stoudite monastery when it was under the iconoclast hegoumenos Leontios 29 but was strongly urged not to do so by Theodoros 15; at the same time he was under strong pressure from his brother (Anonymus 683) to abandon the life of a monk altogether; he was urged by Theodoros 15 not to give way: Theod. Stud., Ep. 263, pp. 391-392.

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