This book establishes Dr. B.R. Ambedkar’s irrefutable authorship of the preamble by uncovering the intellectual origins of its six most central concepts-justice, liberty, equality, fraternity, dignity, and nation. It is clear that its central concepts have their provenance in Ambedkar’s writings and speeches. Through six eponymous chapters, this book unfolds the story of the six constitutional concepts. In doing so, it spotlights fundamental facts about modern Indian history, as well as Ambedkar’s revolutionary political thought, hitherto ignored in conventional accounts.