Theoktistos 21 was hegoumenos of the monastery of the Symbolon when Platon 1 went to live there; described as of good character and distinguished family and said to have had a holy death (οὗ ὁ τρόπος ἀγαθός, τό τε γένος περίβλεπτον, καὶ τὸ τέλος ὅσιον): Theod. Stud., Laudatio Platonis, I 8 (809B). He took Platon 1 under his guidance, and Platon 1 became his trusted confidante: Theod. Stud., Laudatio Platonis, II 11 (813AB), 13 (816AB). After his death his cell was taken over and occupied by Platon 1, who also took over his role as spiritual adviser to the monks: Theod. Stud., Laudatio Platonis, II 14 (816C). Theoktistos 21 was the hegoumenos of the monastery of the Symboloi during the time of Platon 1 and was dead by 816/818 when he was mentioned by Theodoros 15 (Theodore the Stoudite) in a letter written to the unnamed oikonomos of the Symbolon monastery (Anonymus 621): Theod. Stud., Ep. 306.

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