The large majority of the Moro sultanates are, however, small, and have never been fully numbered or described. They generally represent small divisions of territory and subdivisions of tribes, each under one chief who calls himself sultan or datu. Nevertheless, tribal relations and language group these petty divisions into two large distinct groups, the Magindanao and the Iranun. The Magindanao group includes the majority of the tribes. The Iranun group is restricted to the tribes living along the eastern coast of the Bay of Illana from the point of Polloc to the neighborhood of Tukurun, and the whole Ranao region lying between that line and the Bay of Iligan. The Magindanao group is the greater of the two in number, in the extent of its territory, and in fame. Indeed, all the Moros of Mindanao, except the Iranun, were at one time under one influence and were brought under the sole control of the sultan of Magindanao. The Samal Moros, who are variously classified by different writers and who are often mentioned as one of the main divisions of the Moros of Mindanao, are really foreign to Mindanao and belong to a distinct and separate group. Until recently they had never been independent, but had lived under the protection of various datus, and always served the datu for the protection he afforded them, or paid him tribute. They were sea rovers and had no claim on territory anywhere. Lately they have settled down on the Island of Basilan, the Sulu Archipelago, and around the Zamboanga peninsula. The Samals were the latest of the Malay people to arrive in the Philippine Islands. In fact, they are the only Malay people of whom we have positive historical statement of emigration from the Malay Peninsula to Sulu and Mindanao, and were in all probability Mohammedans prior to their arrival in the Philippine Islands. With the Magindanao and Iranun peoples it is different. They were in the land and belonged to the native element of the country long before their conversion to Islam. Islam was successfully introduced and firmly established in Mindanao by one man. This same man founded the sultanate of Magindanao and reformed the whole system of government among his converts. His full name was Sharif Mohammed Kabungsuwan, generally known as Sharif Kabungsuwan.