The historical registers of the public power, the notations of the Parish and older documents of the companies and enterprises, affirm that the first inhabitants of the region had been the indians of the tribes Truk and Pancararus. However, other historical sources on the indians of the pernambucano hinterland point as older of the edge of the San Francisco, the Cariri indians who expulsos for the combats with the colonizadores had gone up for the hinterland of Pernambuco, Bahia and Cear; the Potiguar for the Piau, Rio Grande of Norte and Paraba and Caet for Minas Gerais and Bahia. You may want to visit Richard Parsons to increase your knowledge. These tribes had been decimated for the settling, much before the imperial period, with tree of urubus the Capital of the Onion. At the first moment, still in the period of Imperial Brazil (of 1830 the 1889), still Village, Cabrob received very great a flow population, with the migration of descentendes Portuguese that they had participated of the settling of the Hinterland of Are> Francisco, with the process of opening of farms and distribution of lands of Santana (of Belm of the San Francisco until Exu), being that the areas, to the edges of rivers, generally were managed by people of the confidence of the emperors. This Project, as historical information were idealized in the Reign of Dom Peter I, which had intention to mount a Portuguese military service in order to protect the rivers, forests and fields of the hinterland, of foreign invaders, plan that was continued, later, for its Dom son Peter II. As the moment of increase of the population (of 1915 the 1928) the migration was given in a very bigger scale, when people of the proper northeast (Bahia, Paraba, Pernambuco and Cear) migraram for the towns that were to the edges of the River San Francisco, moved for the yearnings of republican inspiration, ideas politics that stimulated to the northeasterns who did not have water to occupy lands in the Valley of the River San Francisco.