Another main barrier to progress here, has long been the slavish condition of women, not improved by the next creed which came to modify Hindoo institutions. Buddhism was hardly extinct in India, when Mohamedan incursions began to put a strain of new blood into the physical degeneration of the Hindoos, and though the Crescent, except in parts, has never superseded the symbols of the older religion, these two, dwelling side by side, could not be without their reaction on each other's practice. It was the north of the peninsula that became most frequently overflowed by inroads of its Moslem neighbours, while Hindooism was left longer unassailed in the south, where also the aboriginal fetish worships had of old their citadels. Even in the north the conquests of Islam were long temporary and partial, irruptions of pirates or mountain-robbers, able to prey upon the wealth of India only through the want of cohesion among its Rajpoot lords. These early invaders either returned with their booty, or remained to quarrel over it between themselves, or were spoiled of it by fresh swarms from beyond the Himalayas. By the beginning of the thirteenth century, we find a Mohamedan empire set up at Delhi by a dynasty known as the Slave Kings, who, before long, gave place to rival adventurers. The power of the Crescent now began to extend into Southern India, yet revolts of vassals and viceroys kept it continually unstable. At the close of next century, the redoubtable Tamerlane captured Delhi, giving it up to an orgy of slaughter; but this devastating conqueror retired beyond the mountains and left India divided between warring princes, Hindoo and Moslem. Four generations later, Tamerlane's descendant Baber returned to make more enduring conquests; then it was by his grandson, Akbar, that the Mogul empire became firmly founded.