Sanskrit etymology has provided Western scholars with the basis of historical linguistics and modern etymology. Four of the most famous Sanskrit linguists are: Yaska ( centuries BCE) (c. 520–460 BCE) (6th-4th centuries BCE) (2nd century BCE) These linguists were not the earliest Sanskrit grammarians, however. They followed a line of ancient grammarians of Sanskrit who lived several centuries earlier like Sakatayana of whom very little is known. The earliest of attested etymologies can be found in Vedic literature in the philosophical explanations of the Brahmanas, Aranyakas, and Upanishads. The analyses of Sanskrit grammar done by the previously mentioned linguists involved extensive studies on the etymology (called Nirukta or Vyutpatti in Sanskrit) of Sanskrit words, because the ancient Indians considered sound and speech itself to be sacred and, for them, the words of the sacred Vedas contained deep encoding of the mysteries of the soul and God. Ancient Greco-Roman One of the earliest philosophical texts of the Classical Greek period to address etymology was the Socratic dialogue Cratylus (c. 360 BCE) by Plato. During much of the dialogue, Socrates makes guesses as to the origins of many words, including the names of the gods. In his Odes Pindar spins complimentary etymologies to flatter his patrons. Plutarch (Life of Numa Pompilius) spins an etymology for pontifex, while explicitly dismissing the obvious, and actual "bridge-builder": The priests, called Pontifices.... have the name of Pontifices from potens, powerful because they attend the service of the gods, who have power and command overall. Others make the word refer to exceptions of impossible cases; the priests were to perform all the duties possible; if anything lays beyond their power, the exception was not to be cavilled. The most common opinion is the most absurd, which derives this word from pons, and assigns the priests the title of bridge-makers. The sacrifices performed on the bridge were amongst the most sacred and ancient, and the keeping and repairing of the bridge attached, like any other public sacred office, to the priesthood. Medieval Isidore of Seville compiled a volume of etymologies to illuminate the triumph of religion. Each saint's legend in Jacobus de Varagine's Legenda Aurea begins with an etymological discourse on the saint's name: Lucy is said of light, and light is beauty in beholding, after that S. Ambrose saith: The nature of light is such, she is gracious in beholding, she spreadeth over all without lying down,