What happened
Roy co-founded the Atmiya Sabha in 1814, launched the Brahmo Sabha with Debendranath Tagore in 1828, founded the Anglo-Hindu School in 1822 and Vedanta College in 1826, authored the first complete Bengali grammar, campaigned against sati, and estimated that half of India’s revenue was transferred to England.
How we know it
The record shows Roy’s actions through institutional foundations, published texts, and documented outcomes: the Atmiya Sabha (1814), Brahmo Sabha (1828), Anglo-Hindu School (1822), Vedanta College (1826), Gaudiya Vyakaran (first complete Bengali grammar), and the 1829 sati ban. All claims derive from direct statements in the source material.
Why it went that way
Roy succeeded because he combined vernacular scholarship (Bengali grammar), Sanskritic theology (Vedanta), Western-facing pedagogy (Anglo-Hindu School), and diplomatic engagement with British authorities — all directed at specific, actionable goals like sati abolition and curriculum reform.
What is still contested
The source does not state who disagreed with Roy or why. It gives no evidence of opposition to his campaigns, institutions, or economic estimate — so contestation is unrecorded and cannot be asserted.
What it changed
His campaign led directly to the 1829 abolition of sati. His institutions embedded monotheistic Vedanta into formal education. His grammar established a linguistic standard. His revenue estimate framed colonial extraction as a quantifiable grievance — but the source does not say whether this estimate influenced policy or debate beyond its articulation.
Is it worth your time
Yes — Roy demonstrates how a single reformer, operating within colonial constraints, used institution-building, textual authority, and targeted advocacy to secure concrete legal change and reshape religious education. His methods remain legible and replicable.