The Great Rhetra (Greek: Μεγάλη Ῥήτρα, literally: Great "Saying" or "Proclamation", charter) was used in two senses by the classical authors. In one sense, it was the Spartan Constitution, believed to have been formulated and established by the quasi-legendary lawgiver, Lycurgus. In the legend, Lycurgus forbade any written constitution. It was therefore presumed to have been oral.
In a second sense, the rhetra refers to an oracle of Delphi, which was believed to have contained the entire constitution in verse. The credo of being unwritten fails in this case, as a written record of all oracles was maintained by the priests at Delphi. They and others consulted it frequently. It survived long after the demise of the oracle but is missing now, except for fragments handed down by classical authors.
