Euschemon 5 was archbishop of Kaisareia in Cappadocia; he was the addressee of a number of letters from the patriarch Photius (Photios 1); the letters are mainly theological in character: Photius, Ep. 173 (II 47 Laourdas-Westerink; October 867 or c. 873), Ep. 186 (II 75f. Laourdas-Westerink; 868/871), Ep. 76 (I 118f. Laourdas-Westerink), Ep. 77 (I 118f. Laourdas-Westerink), Ep. 157 (II 12f. Laourdas-Westerink), Ep. 202 (II 101f. Laourdas-Westerink), Ep. 213 (II 116f. laourdas-Westerink), Ep. 246 (II 178f. Laourdas-Westerink), Ep. 247 (II 179f. Laourdas-Westerink) (all undateable). The letters are addressed Εὐσχήμονι ἀρχιεπισκόπῳ Καισαρείας Καππαδοκίας or similar.

He was the joint addressee with Georgios bishop of Nikomedeia (Georgios 223) of a letter from Photios 1, probably late in 869: Photius, Ep. 126 (I 164 Laourdas-Westerink; addressed Εὐσχήμονι καὶ Γεωργίῳ μητροπολίταις). His last known predecessor as bishop of Kaisareia was Paulos 85, who was deposed in 861. He may therefore have been consecrated as bishop in that year by Photios 1; cf. Photius, Ep. 126, line 6 (I 164 Laourdas-Westerink). At the Council of Constantinople in 869/870 he supported the cause of Photios 1: Mansi XVI 86D (the name Euthymios is an error, see on this Photius, Epistulae, ed. Laourdas-Westerink I, p. 118), 99B. In 879/880 the archbishop of Kaisareia was called Prokopios (PBE II); see Mansi XVI 348C. Euschemon was possibly dead by then.

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