Medieval Architecture of (undivided) India, both of the Sultanate (1192-1526 A.D.) and the Mughal Period (1526-1658 A.D.) had been greatly misinterpreted and misrepresented by the British of the East India (Trading) Company, as a matter of policy. It is only, much later, after the Independence (1947) that its study could be undertaken in the right earnest and the correct perspective. Architecture constitutes a veritable chronicle in stone. The stamp of an Age and a People - their tastes, beliefs, values, ideas, skills and achievements - everything that makes up a civilization, is most faithfully imprinted upon their monuments. Indo-Muslim Architecture is a fine art, as much as a source of Medieval Indian History and Culture and, as such, it must be conceived and studied as a discipline, without the romantic tales with which it has been hitherto associated. This work covers the fundamental aspects of the Historiographical Study of Indo-Muslim Architecture and ventures to theorise it and make it a perfect discipline.