The core beliefs about desire, suffering, and the search for enlightenment preached by the historic Buddha and recorded by his followers into sutras and other scriptures were, in part, a reaction to the Vedic beliefs and rituals dominant in South Asia. Buddhism changed over time as it spread throughout Asia — first through the support of the Mauryan Emperor Ashoka, and then through the efforts of missionaries and merchants, and the establishment of educational institutions to promote its core teachings.