Ancient scholar of Sanskrit literature Panini framed the
Sanskrit grammar in 4th century BC. His work was based on the
fundamental text of the grammatical chapter of the 'Vedanga'.
Panini's grammer was titled as 'Ashtadhyayee'.
Prior to Panini there have some 9 grammarians who have
formulated the Principles of Grammar, but many of these have been
lost to posterity.
It may be noted that, Panini's is the most succinct and achievs
the task of encoding the Descriptive Grammar rules in less than
4000 sutras(= aphorisms). The term vedA~Nga is used to refer to the
six auxiliary subjects that need be studied in order to
"understand" The Vedas. vyAkaraNa(Grammar) is one of them.