m. l. west argues on poetic, linguistic, cultural and political grounds that an athenian poet "compiled the "catalogue of women" and attached it to hesiod's "theogony", as if it were all hesiodic," sometime between 580 and 520 bce, and thinks it possible that this range might be narrowed to the period following 540. he sees, for example, the marriage of xuthus to a daughter of erechtheus as a means of subordinating all of ionia to athens, since their union produced the eponym ion. similarly, sicyon is made a son of erechtheus (fr. 224), which west takes as a reflection of the tyrant cleisthenes of sicyon's attempts to promote ionian–athenian interests in the polis, which had traditionally been more closely connected to dorian argos. these and other considerations would, in west's view, establish a "terminus post quem" of , but he prefers a later dating on the assumption that "theogony" 965–1020, which he assigns to the latter portion of the sixth century bce, was contemporaneous with the composition of the "catalogue".