Ruler X
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Ruler X, as a designation sometimes used by Mayanists to refer to a personage whose name has not otherwise been deciphered, may refer to:
- Ruler X (Rio Azul), ruler associated with Tomb 1 at Rio Azul, born 417 CE
- Ruler X (Toniná), ruled at Toniná, ca. 514 CE
- K'inich Toob'il Yopaat, ruler at Caracol reigning sometime between 810–830 CE, known as Ruler X prior to proposed decipherment of name glyph