Asvaghosa was the contemporary of Ruler Kanishka. He was a poet, dramatist, musician, and scholar.
Nagarjuna was the contemporary of Satvahana kings. He pronounced the Madhyamika school of Buddhist philosophy known as Sunyavada.
Asanga was the most important teacher of the Yogacharya or Vijnanavada School founded by his guru Maiteryanath.
Vasubandhu’s greatest work Abhidharmakosa is considered as an important source of Buddhism.
Buddhaghosha lived in 5 AD and was a Pali scholar. The commentaries and the Visuddhimaga written by him are the great addition in the post Tripitakas literature.
Dignaga is a well-known 5-century Buddhist logic scholar.