The article considers the opinion that Antigonus I the One-Eyed, the first of the diadochi to assume the royal title in the so-called year of kings (306-304 BC), calculated his "reign" not from 306 BC, but from an earlier time (as did his rivals Seleucus I and Ptolemy I). In some parts of Antigonus ' empire - Babylonia and Edom - there is indeed a system of dating documents with his name from 317/316 BC (since the death of Philip III Arrhidaeus). This system was introduced by Antigonus retrospectively in 315/314 BC; the most recent documents using it (originating in Babylonia) However, there is no clear evidence that Antigonus and his son Demetrius Poliorcetes applied this system of reckoning after 306 BC, when they officially assumed the royal titles. The decree from the city of Caunum to Caria is obviously dated to the" fifteenth year " of the reign of Antigonus II Gonatus (283-239 BC), and not to Antigonus I the One-Eyed, and the manumission from Beroi, despite problems with the interpretation of its mysterious dating ("twenty-seventh year of the reign of Demetrius"), should be associated with Demetrius II (239-229 BC), and not with Poliorcetes (who, according to E. Grzybek, used the" era " of Antigonus from 317/316 BC during his rule in Macedonia in 294-288 BC). Key words: Antigonids, Antigonus I the One-Eyed, Demetrius I Polyorcetes, Diadochi, dynastic era, Hellenism, Babylonia, Edom, Macedonia. The view that Antigonus I the One-eyed (Monophthalmus), the first of the diadochi to assume the royal title and initiate the so-called Year of kings (306-304 BC), 1 is now becoming increasingly widespread, and counted his reign not from 306 BC, but from an earlier time, as it is now known. It was made by his rivals Seleucus I and Ptolemy I 2. It is even suggested that Seleucus may have only imitated the experience of Antigonus [Boiy, 2009, p. 476, p. 30]. However, as will be shown later, in the case of the founder of the Antigonid dynasty, the retrospective dating of hi ... Read more