Spanish–Moro conflict
The Spanish initiated the conflict by conquering the Philippines and invading Moro territory in an effort to subjugate the region to their rule since the 1500s. When the Spanish conquered the Muslim Kingdom of Maynila, a vassal of the Sultanate of Brunei, the Islamic rajah, Rajah Sulayman resisted the Spanish. Manila then became the capital of the Spanish Philippines after the conquest, with the Spanish forcibly converting people to Catholicism. The Spanish–Moro Wars started with the Castille War, a war between Spaniards and the Sultanate of Brunei. (The term "Moro" at this time included Muslim Tagalogs who were ruled by the Sultanate of Brunei).
History of the Philippines
Spanish power was further consolidated after Miguel López de Legazpi's complete assimilation of Madja-as, his subjugation of Rajah Tupas, the Rajah of Cebu and Juan de Salcedo's conquest of the provinces of Zambales, La Union, Ilocos, the coast of Cagayan, and the ransacking of the Chinese warlord Limahong's pirate kingdom in Pangasinan.