<Table> <Tr> <Td> </Td> <Td> Some of this article's listed sources may not be reliable . Please help this article by looking for better, more reliable sources . Unreliable citations may be challenged or deleted . (June 2012) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Some of this article's listed sources may not be reliable . Please help this article by looking for better, more reliable sources . Unreliable citations may be challenged or deleted . (June 2012) (Learn how and when to remove this template message) </Td> </Tr> <P> The Amarakosha (Devanagari: अमरकोशः, IAST: Amarakośa) is the popular name for Namalinganushasanam (Devanagari: नामलिङ्गानुशासनम्, IAST: Nāmaliṅgānuśāsanam) a thesaurus in Sanskrit written by the ancient Indian scholar Amarasimha . It is the oldest extant kosha . The author himself mentions 18 prior works, but they have all been lost . There have been more than 40 commentaries on the Amarakosha . </P> <P> The word "Amarakosha" derives from the Sanskrit words amara ("immortal") and kosha ("treasure, casket, pail, collection, dictionary"). The actual name of the book "Namalinganushasanam" means "instruction concerning nouns and gender". </P>

Who wrote the text amarkosha during the gupta age