The accounts of how Alexander came to power vary somewhat in minor points. Diodorus Siculus tells us that upon the assassination of the tyrant Jason of Pherae, in 370 BC, his brother Polydorus ruled for a year, but he was then poisoned by Alexander, another brother. However, according to Xenophon, Polydorus was murdered by his brother Polyphron, who was, in turn, murdered by his nephew Alexander —son of Jason, in 369 BC. Plutarch relates that Alexander worshipped the spear he slew his uncle with as if it were a god. Alexander governed tyrannically, and according to Diodorus, differently from the former rulers, but Polyphron, at least, seems to have set him the example. The states of Thessaly, which had previously acknowledged the authority of Jason of Pherae, were not so willing to submit to Alexander the tyrant, (especially the old family of the Aleuadae of Larissa, who had most reason to fear him). Therefore, they applied for help from Alexander II of Macedon.