Proterios 1 was a Stoudite monk; addressee of two letters from Theodoros 15 (Theodore the Stoudite) written in early 818: Theod. Stud., Ep. 297, p. 436 (a. 818 Januray/February); Ep. 303, pp. 445-446 (a. 818 spring) (both addressed Προτερίῳ τέκνῳ). He is mentioned in eleven further letters from Theodoros 15, all written between 815 and 826, where he is referred to as ὁ ἀδελφὸς Προτέριος (or similar); he often delivered letters of Theodoros 15 to the addressees: Theod. Stud., Epp. 104, p. 221, line 2; 107, p. 225, line 10; 108, p. 226, line 15; 110, p. 228, line 16; 115, p. 235, line 35; 118, p. 237, line 14; 120, p. 239, line 12 (all to Naukratios 1); 143, p. 259, line 6 (to Anonyma 107); 155, p. 276, line 15 (to Litoios 1); 284, p. 424, line 22 (to Naukratios 1); 436, p. 613, line 7 (to Eudoko 1).

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