Raja Ram Mohan Roy was a 19th century Indian social reformer who worked to abolish social evils like sati and child marriage and establish greater rights for women and oppressed castes. He founded the Brahmo Samaj in 1828 to promote social, religious, and educational reforms through teachings of monotheism, opposition to idolatry and rituals, and promotion of rational inquiry. Some of his major reforms included campaigning for women's rights including right to property and remarriage for widows, abolishing the practice of sati and polygamy, and opposing the caste system and advocating for equality among all people.