Solution:

Vellithiruthi Thazhathu Manayil Raman Bhattathiripad

He was a key figure in removing casteism and conservatism that existed in the Namboothiri community.

Encouraged widow marriage in the Brahmin society and tried to reform the conservative practices of the Namboodiri community.

First widow remarriage was conducted by V. T. in 1937.

He conducted the first mixed-race marriage in the Brahmin society.

The Hindu Widows’ Remarriage Act, 1856, also Act XV, 1856, enacted on 26 July 1856, legalised the remarriage of Hindu widows in all jurisdictions of India under East India Company rule.