But the Venetians still held the cities in the greater part of the Morea, and some of the islands, and traded all over the East and West, though their Greek subjects were only kept under by main force, still held to their own Greek Church, and looked to the Roman Emperor of the East, as they called the Palæologus at Constantinople, as their head; nor was it easy to overpower people who had so many mountain fastnesses, nor to tame monks whose convents were nests on the top of rocks, some so steep that there was no way of entering them save being drawn up in a basket.  Well was it for them that they had niched themselves into such strongholds, for worse and worse days were coming upon Greece.  The terrible nation of Turks were making their way out of the wild country north of Persia, and winning the old cities of Asia Minor, where they set up their Mahommedan dominion, and threatened more and more to overthrow the Greek empire altogether.