Brihat Trayi the three ancient Indian medical scriptures

The following three works known as the Brihat-Trayi were the three famous ancient Indian medical scriptures.

Charaka Samhita composed in 2nd century BC by Agnivesa and later edited by Charaka.
Sushruta Samhita was composed IN 5th century BC by Sushruta.
Ashtanga Hridayam Samhita was composed in 6th century AD by Vagbhata.