By the end of the 16th century the local rulers were beginning to push back and, with the support of the Omani Sultan Saif bin Sultan they began to defeat the Dutch and the Portuguese. His successor Said bin Sultan increased Omani Arab influence in the region, moving his administration to nearby Zanzibar, which came under Omani rule. Nevertheless, the Comoros remained independent, and although the three smaller islands were usually politically unified, the largest island, Ngazidja, was divided into a number of autonomous kingdoms (''ntsi'').