Laurentios 4 was a Stoudite monk, the addressee of two letters from Theodoros 15 (Theodore the Stoudite): Theod. Stud., Epp. 168, 449 (both addressed Λαυρεντίῳ τέκνῳ). In mid or late 816 Theodoros 15 wrote to praise him for his fidelity (πιστὸς υἱὸς εἶ, φιλοπάτωρ, φιλάδελφος) and to send greetings to Dionysios 6; Laurentios 4 is also styled τέκνον and υἱέ μου ποθητέ: Theod. Stud., Ep. 168. In 821 he was the joint addressee with Dionysios 6, Litoios 1, Poimen 1, Symeon 27 and other monks who were living scattered in exile of a letter of exhortation and hope from Theodoros 15 at the end of the persecution under Leo V (Leo 15): Theod. Stud., Ep. 433 (Κατηχητική. τοῖς ἠγαπημένοις πνευματικοῖς τέκνοις τε καὶ ἀδελφοῖς Λαυρεντίῳ, Συμεών, Διονυσίῳ, Ποιμένι, Λιτοΐῳ καὶ τοῖς λοιποῖς ὧδε κἀκεῖσε διεσπαρμένοις). Between 821 and 826 Laurentios 4 was apparently living in the town of Antisarchos (ἐν τῇ Ἀντισάρχῳ κωμοπόλει), where, as he wrote to inform Theodoros 15, the family of a suicide was being ignored by everyone there except by Makarios 11: Theod. Stud., Ep. 449.

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