Mid 9th century: Birth of Arethas in Patra
888: Arethas still a layman
895: Mentioned as a deacon
902 / 903: Bishop of Caesarea in Cappadocia
end of 906 / beginning of 907: Arethas supports Leo VI on the issue of his fourth marriage
912: Patriarch Nicholas Mystikos, after his return to the throne, deposes Arethas from his position together with other supporters of the deposed patriarch Euthymios (907-912)
920: Appears as co-author, with emperor Romanos I Lakapenos, of the Tome of Union
July / September 931: Supports Romanos I Lakapenos in his attempt to get his son Theophylaktos elected as patriarch of Constantinople
April 932: last mention of Arethas (in a manuscript)
after April 932: death, probably shortly after this date