Anastasios 4 was a metropolitan bishop subject to the Arabs, Anastasios 4 was arrested by Selichos 1 while celebrating Easter and imprisoned but averted a catastrophe by calming Selichos 1: Theoph. AM 6253. The circumstances and the location are very obscure; according to Theophanes the "Kasiotai" (οἱ Κασιῶται) rebelled against the Arabs and in consequence Selichos 1 took violent reprisals which would have been much worse but for Anastasios 4 (described by Theophanes as (ὁ μακαριώτατος Ἀναστάσιος). See also Selichos 1. Kasiotis was the name of a region in Syria south of Antioch and this may have been the location of these events; if so, Anastasios 4 was a bishop in the area. The Melkite patriarch of Antioch at this time was Theodoros 10 and the Jacobite patriarch was Ioannes (of Callinicum); cf. Grumel, Chronologie, pp. 447, 449.

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