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).
Spanish language
Spanish was an official language of the Philippines from the beginning of Spanish administration in 1565 to a constitutional change in 1973. During Spanish colonization (1565–1898), it was the language of government, trade and education, and spoken as a first language by Spaniards and educated Filipinos. In the mid-nineteenth century, the colonial government set up a free public education system with Spanish as the medium of instruction. This increased use of Spanish throughout the islands led to the formation of a class of Spanish-speaking intellectuals called the "Ilustrados". By the time of Philippine independence in 1898, around 70% of the population had knowledge of Spanish, with 10% speaking it as their first and only language and about 60% of the population spoke it as their second or third language.