In 1638 another expedition against the Moros was headed by the Gov.-General Sebastian Hurtado de Corcuera, who made the first landing of troops in Sulu Island on April 17 of that year. He also established some military posts on the coast of Mindanao Island, one of which was Sampanilla (now called Malabang) on the Illana Bay shore. Four years afterwards it was abandoned until 1891, when General Weyler went there and had a fort built, which still exists. It would appear that all over these Islands the strong preyed on the weak, and the boldest warrior or oppressor assumed the title of Sultan, _Datto_, etc., over all the territory he could dominate, making the dignity hereditary. So far as can be ascertained, one of the oldest titles was that of Prince of Sibuguey, whose territory was situated on the bay of that name which washes the N.E. coast of Zamboanga Province. The title fell into disuse, and the grandson of the last prince, the present _Manguiguin_, or Sultan of Mindanao, resides at Dinas. The sultanate dates from the year 1640, but, in reality, there never was a sultan with effective jurisdiction over the whole island, as the title would seem to imply. The Sultan's heir is styled the _Rajahmudah_. The alliances effected between the Sulu and Mindanao potentates gave a great stimulus to piracy, which hitherto had been confined to the waters in the locality of those islands. It now spread over the whole of the Philippine Archipelago, and was prosecuted with great vigour by regular organized fleets, carrying weapons almost equal to those of the Spaniards. In meddling with the Mahometan territories the Spaniards may be said to have unconsciously lighted on a hornets' nest. Their eagerness for conquest stirred up the implacable hatred of the Mahometan for the Christian, and they unwittingly brought woe upon their own heads for many generations. Indeed, if half the consequences could have been foreseen, they surely never would have attempted to gain what, up to their last day, they failed to secure, namely, the complete conquest of Mindanao and the Sulu Sultanate.