Ven. Buddhaghosa , the great Buddhist Scholar

Buddhaghosa live in 5^th century in Indian and He is a Theravada great scholar and commentator. His one of the best work is Visuddhimagga (path of purification. a comprehensive summary and analysis of the Theravada understanding of the Buddha's path to liberation. 

His name means (Bhadantā+cariyā) and "Enlightened Utterances” or voice of the Buddha.  Buddhaghosa as having come to Sri Lanka from India, and settled in Anuradhapura.

The Mahavamsa records that Buddhaghosa was born into a Brahmin family in the kingdom of Magadhi. He is said to have been born near Bo tree, and to have been a master of the Vedas traveling through India engaging in philosophical debates. Only upon encountering a Buddhist monk named Revata was Buddhaghosa bested in debate, first being defeated in a dispute over the meaning of a Vedic doctrine, and then being confounded by the presentation of a teaching from the Abhidhamma Impressed, Buddhaghosa became a Buddhist monk and undertook the study of the Tipitaka and its commentaries. On finding a text for which the commentary had been lost in India, Buddhaghosa determined to travel to Sri Lanka to study a Sinhalese commentary that was believed to have been preserved.

In Sri Lanka, Buddhaghosa began to study a very large volume of commentarial texts that the preserved by the monks of the Mahavihara in Anuradhapura. He wrote the visuddhimagga. His abilities were further tested when deities intervened and hid the text of his book, twice forcing him to recreate it from grate. When the three texts were found to completely summarize all of the Tripitaka and match in every respect, the monks acceded to his request and provided Buddhaghosa with the full body of their commentaries.