 Later, he disagreed with the views of his guru and began to travel India.He successfully debated with many scholars and philosophers during this time and won over Naraharitirtha, a minister in Kalinga, who would later become Madhvacharya's first notable disciple.Unlike Adi Shankaracharya (788–820) who preached Advaita philosophy (monism) and Ramanujacharya who propounded Vishishtadvaita philosophy (qualified monism), Madhvacharya taught the Dvaita philosophy (dualism).