Next to Bhattara Haricandra among the commentators of Caraka Samhita comes Jejjata in point of time. It is established that he was a pupil of Vagbhatta and hence we find no difficulty in fixing his period in the 9th century A D. He wrote a commentary on Susruta also which is the oldest known commentary on the work Dalhana, a later comm�entator on Susruta quotes from Jejjata�s commentary and so does Candrata,� the grandson of Vagbhatta (according to Aufrecht the author of Catalogue Catalogorum), and so it must have been available upto Dalhana�s and Candrata�s time. A revised edition of his commentary copied from Madras Government Oriental Library has been published. The revision was done by Haridatta.
His commentary on Caraka is known as Nirantarapada- vyakhya and only the following sections of his commentary are not available at present.
Cikitsa5-71 to Cikitsa 23-160, Kalpa 1-5, Siddhi 2, Siddhi 7-32 to end.
Some people believe that he was the son of Kaiyata. This belief seems to have sprung from the fact that Kaiyata had a son named Jaiyata and the letters are phonetically interchange�able but this Jaiyata and Jejjata were not the same person and the identification rests on no surer foundation than a similarity of sounds, which again is based on the interchangeability of sounds during the Prakrta formation period.
Jejjatamay be a Kashmirian as is suggested by the 't� ending of his name which was common among the Kashmirians e.g. Kaiyata, Mammata and others. But more probably he was an inhabitant of Sind, as he studied under Vagbhatta, though nothing could have prevented an ardent Kashmirian to undertake the hazards of travel to Sind to have the privilege of studying under so famous a precep�tor as Vagbhatta.