Ratnākaraśānti

Ratnākaraśānti (also known as Śāntipa) (c. 10th-century CE) was one of the eighty-four Buddhist Mahāsiddhas and a monk at the monastic university of Vikramashila in what is now modern-day Bihar in India. At Vikramashila he was instructed by Nāropa, and taught both Atīśa and Maitrīpa. His texts include several influential commentaries to Buddhist tantras, as well as works of philosophy and logic.

He was known as ''kalikālasarvajña'' meaning "Omniscient One of the Degenerate Age". Provided by Wikipedia