That motive was the continued subjugation of the numerically superior inhabitants of the Messenian plain, who were forced to serve as helots after losing two wars to the state this document governed.
The poems of Tyrtaius and Alkman are roughly contemporaneous sources for this document, which was probably written in the early 600s BC. According to Plutarch, its author obtained a Delphic prophecy exhorting its adoption. Both Xenophon and Aristotle wrote books about this document, lauding its promotion of eunomia. The latter's commentary is lost and the former entirely neglects the motive for the  institutions this document created, such as the agoge and the krypteia. That motive was the continued subjugation of the numerically superior inhabitants of the Messenian plain, who were forced to serve as helots after losing two wars to the state this document governed. For ten points, name this document, traditionally ascribed to Lycurgus, which sets up the political and social institutions of a certain militaristic Peloponnesian city-state.
The poems of Tyrtaius and Alkman are roughly contemporaneous sources for this document, which was probably written in the early 600s BC.
{Spartan Constitution} (accept {Constitution} of {Lycurgus} and {variants} until {he} is named; accept {Great Rhetra})