‘The Notes on Infant Marriage and Enforced Widowhood’ was written by

Behramji Merwanji Malabari, a prominent Parsi poet, journalist, and social reformer, published his influential circular titled 'Notes on Infant Marriage and Enforced Widowhood' in $1884$. His dedicated advocacy against child marriage led directly to the enactment of the Age of Consent Act in $1891$.