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 in the Philippines
Until the Second World War, Spanish was the language of Manila. After the war, the English-speaking U.S. having won three wars [in 1898, against Spain (Spanish–American War); in 1913 (from Philippine–American War to Moro Rebellion) against the Filipino independence; in 1945 against Japan (Philippines Campaign)], the English language was imposed.