Anonymus 588 was a magistros (ὁ μάγιστρος) and was one of the high dignitaries who received the emperor Theophilos 5 at Hieria when Theophilos 5 returned victorious from his campaign against the Saracens of Cilicia; the others present included the augousta (Theodora 2), the emperor's representative (Anonymus 587) and the eparch of the City (Anonymus 589): Const. Porph., Military Treatises, C 812-824 (Reiske 503-504). When Theophilos 5 entered the Golden Gate, Anonymus 588, Anonymus 587 and Anonymus 589 presented him with a bejewelled crown: Const. Porph., Military Treatises, C 846-849 (Reiske 503-506). The date is usually accepted as 831, see Haldon, Expeditions, p. 285, but see W. T. Treadgold, "The Chronological Accuracy of the Chronicle of Symeon the Logothete for the Years 813-845", in DOP 33 (1979), p. 178 for an alternative date in 837.

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