Complicated and often confused, as the political scene of the country of the period under review was, it was dominated by three groups of powers-the Carnatic Nawabs, the auxiliary powers and the European companies. Attention has been given to furnish a succinct account of the three groups of powers, but without diluting the main theme. which fundamentally centres on the Nawabs, the sovereigns of the country. The major topics discussed in this thesis are entirely original. Specifically, this attribute applies to the chapters on the Mughal-Maratha struggle for supremacy, the Wallajah endeavour to retain the control of Tiruchirapalli, the consolidation of Walla- jah power the suppression of the rebellions organised by Maphuz Khan and Khan Saheb,ex- tension of Nawab’s hegemony over the various palayams and the steady ascendancy of the English, leading to the establishment of their direct administration.