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Ishwar Chandra Vidyasagar :

He is considered the "father of Bengali prose". He was the most prominent campaigner for Hindu widow remarriage and petitioned Legislative council despite severe opposition and a counter petition against the proposal with nearly four times more signatures by Radhakanta Deb and the Dharma Sabha.

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Raja Ram Mohan Roy ;

He preached the unity of God, made early translations of Vedic scriptures into English, co-founded the Calcutta Unitarian Society and founded the Brahma Samaj. The Brahma Samaj played a major role in reforming and modernizing the Indian society. He successfully campaigned against sati, the practice of burning widows.