According to what can be inferred from somewhat later accounts, the Filipinos of the 15th century must have engaged primarily in shifting cultivation, hunting, and fishing. Sedentary cultivation was the exception. Only in the mountains of northern Luzon, where elaborate rice terraces were built some 2,000 years ago, were livelihood and social organization linked to a fixed territory. The lowland peoples lived in extended kinship groups known as barangays, each under the leadership of a datu, or chieftain. The barangay, which ordinarily numbered no more than a few hundred individuals, was usually the largest stable economic and political unit.
Within the barangay the status system, though not rigid, appears to have consisted of three broad classes: the datu and his family and the nobility, freeholders, and “dependents.” This third category consisted of three levels—sharecroppers, debt peons, and war captives—the last two levels being termed “slaves” by Spanish observers. The slave status was inherited but, through manumission and interclass marriage, seldom extended over more than two generations. The fluidity of the social system was in part the consequence of a bilateral kinship system in which lineage was reckoned equally through the male and female lines. Marriage was apparently stable, though divorce was socially acceptable under certain circumstances.
Early Filipinos followed various local religions, a mixture of monotheism and polytheism in which the latter dominated. The propitiation of spirits required numerous rituals, but there was no obvious religious hierarchy. In religion, as in social structure and economic activity, there was considerable variation between—and even within—islands.
This pattern began to change in the 15th century, however, when Islam was introduced to Mindanao and the Sulu Archipelago throughBrunei on the island of Borneo. Along with changes in religious beliefs and practices came new political and