The author of the oldest extant Sanskrit grammar was Panini, a native of extreme north-west India,... His work consists of nearly 4000 aphorisms, each of which owing to the extreme conciseness of the style, generally consists of not more than two or three words. Hence, the whole grammar could be printed within the compass of about thirty-five octavo pages. Yet it describes the entire Sanskrit language with a completeness which has never been equalled elsewhere. Thus it is at once the shortest and the fullest grammar in the world.

Gazetteer in: Sanskrit literature,The Digital South Asia Library - University of Chicago (dsal.uchicago.edu)