Q. Who is considered one of them as the greatest revivalists of Advaita Vedanta?
Answer: Adi Shankaracharya
Notes: By expounding the unity of the Atman and Nirguna Brahman "brahman without attributes", Adi Shankaracharya established the importance of monastic life as enshrined in the Upanishads and Brahma Sutra by reviving ritualism in Hinduism. He founded four mathas ("monasteries") of Hinduism, which helped in the revival and spread of Advaita Vedanta.

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