Note 2 — Chapter XII · Progress and Revolution. 1837–1897.

Subjection of the Igorrote Tribes.—With Claveria began a decisive policy of conquest among the Igorrote tribes of northern Luzon, and by the end of Spanish rule these mountains were dotted with cuartels and missions for the control of these unruly tribes. The province of Nueva Vizcaya has been particularly subject to the raids of these head-hunting peoples. Year after year the Christian towns of the plains had yielded a distressing sacrifice of life to satisfy the savage ceremonials of the Igorrotes.2