At that time the true Malays, the tribe from which the common term "Malayan" has been derived, were a small people of Sumatra. At least as early as 1250 they were converted to Mohammedanism, brought to them by these Arabian missionaries, and under the impulse of this mighty faith they broke from their obscurity and commenced that great conquest and expansion that has diffused their power, language, and religion throughout the East Indies. Mohammedan Settlement in Borneo.--A powerful Mohammedan Malay settlement was established on the western coasts of Borneo certainly as early as 1400. The more primitive inhabitants, like the Dyaks, who were a tribe of the primitive Malayans, were defeated, and the possession of the coast largely taken from them. From this coast of Borneo came many of the adventurers who were traversing the seas of the Philippines when the Spaniards arrived. The Mohammedan Population of Mindanao and Jolo owes something certainly to this same Malay migration which founded the colony of Borneo. But the Maguindanao and Illano Moros seem to be largely descendants of primitive tribes, such as the Manobo and Tiruray, who were converted to Mohammedanism by Malay and Arab proselyters. The traditions of the Maguindanao Moros ascribe their conversion to Kabunsuan, a native of Johore, the son of an Arab father and Malay mother. He came to Maguindanao with a band of followers, and from him the datos of Maguindanao trace their lineage. Kabunsuan is supposed to be descended from Mohammed through his Arab father, Ali, and so the datos of Maguindanao to the present day proudly believe that in their veins flows the blood of the Prophet. The Coming of the Spaniards.--Mohammedanism was still increasing in the Philippines when the Spaniards arrived. The Mohammedans already had a foothold on Manila Bay, and their gradual conquest of the archipelago was interrupted only by the coming of the Europeans. It is a strange historical occurrence that the Spaniards, having fought with the Mohammedans for nearly eight centuries for the possession of Spain, should have come westward around the globe to the Philippine Islands and there resumed the ancient conflict with them. Thus the Spaniards were the most determined opponents of Mohammedanism on both its western and eastern frontiers. Their ancient foes who crossed into Spain from Morocco had been always known as "Moros" or "Moors," and quite naturally they gave to these new Mohammedan enemies the same title, and Moros they are called to the present day.