At the time of the reign of the Macedonian kings, the sanctuary of Zeus Olympios was the most important sanctuary of the city and the religious center of Macedonia. It has not yet been clarified whether the shrine was given its importance by the Olympic Games initiated by King Archelaus, or whether, inspired by Homer's Iliad, it had already played a central role for the region. Deucalion claimed that in Dion, after the sanctuary of Zeus Lykaios, the second oldest altar devoted to Zeus was erected. From the late 8th century BC, Zeus was worshiped at various places in Greece. It was common to all these Zeus sanctuaries that they took place on the summit of a mountain, or near a summit. Inscriptions, pottery and remains of charcoal from the Hellenistic and Roman period on the summit of Agios Antonios (2817 m) near Dion, testify that the cult of Zeus was practiced not only in Dion, as also on Mount Olympus. The Macedonian kings used the temple to archive their royal decrees. Some of them are exhibited in the Archaeological Museum of Dion.