About the year 1400 something happened which changed the beliefs and customs of many of the tribes of the southern Philippines and made of them a powerful and dreaded people.  
It was about this time that Arabian traders and missionaries began to establish themselves in the Islands, and soon these were followed by hordes of Mohammedan converts from the islands to the south. Among the newcomers were men who became powerful rulers, and they, in time, brought together many of the settlements which formerly had been hostile to each other and united them under the faith of Islam. Those who accepted the new faith adopted the dress and many of the customs of their teachers and came to be known as Moro.
 
With the possession of firearms, which were introduced by the newcomers, the Moro grew very daring and were greatly feared by the other natives. And soon they began to make long trips on the sea to the north and south, carrying on trade and making many surprise attacks for loot and slaves.
 
At the time the Spaniards discovered the Philippines, the Moro were a terror to the other inhabitants, and they continued to be so until very recent years. They became ferocious pirates i............