This article argues that the genealogy of modern anti-caste critique is incomplete without a contextualized and close reading of Jatibhed Viveksar, a nineteenth-century Marathi-language text written under the pseudonym Ek Hindu (‘One Hindu’ or ‘A Hindu’). One of the first lower-caste commentaries in the Marathi print-world, the treatise clearly departed from the earlier iterations of non-Brahman caste politics in western India and laid the groundwork for what later came to be known as the ‘anti-caste movement’. I demonstrate how Jatibhed Viveksar engaged with preceding expressions of caste politics in western India by disputing two commonly deployed concepts in early modern caste controversies: first, the received proscriptions against varna sankara (or the intermixing of castes) and, second, the idea that the Shudras were the progeny of the ‘moral failure’ of varna sankara. Ek Hindu argued that not just the Shudras, but the Brahmans too have mixed-caste ancestors and thus cannot claim purity of lineage. Moreover, the author wrested the Shudras from a constellation of negative meanings by deploying the ‘Aryan invasion narrative’; he represented them as indigenous heroes who were vanquished by the Aryan-Brahmans. The conceptual innovations, intellectual sources, and frames of thought mobilized by Jatibhed Viveksar have significantly shaped the common sense of the ensuing articulations of anti-caste politics.