Avesta word for "praise-song" (Bartholomae: "Lobgesang"); that word is not actually attested in any text. The surviving texts of the Avesta, as they exist today, derive from a single master copy produced by Sasanian Empire-era (224–651 CE) collation and recension. That master copy, now lost, is known as the 'Sassanian archetype'. The oldest surviving manuscript ("K1") of an Avestan language text is dated 1323 CE. Summaries of the various Avesta texts found in the 9th/10th century texts of Zoroastrian tradition suggest that a significant portion of the literature in the Avestan language has been lost. Only about one-quarter of the Avestan
Avesta in the royal archives ("Dk" 4B, 5). Following Alexander's conquest, the Avesta was then supposedly destroyed or dispersed by the Greeks after they translated the scientific passages that they could make use of ("AVN" 7–9, "Dk" 3B, 8). Several centuries later, one of the Parthian emperors named Valaksh (one of the Vologases) supposedly then had the fragments collected, not only of those that had previously been written down, but also of those that had only been orally transmitted ("Dk" 4C). The "Denkard" also transmits another legend related to the transmission of the Avesta. In that story, credit for collation and