The ring and the lettered tripod
At a treason trial under Emperor Valens, the accused Hilarius and Patricius described a tripod table of laurel wood with a round metal plate engraved with the alphabet. A ring hung on a linen thread swung over the letters to spell out answers, which were read as naming the next emperor. The episode led to executions.
Uses: Ring, Linen thread, Lettered plate
