Fray Casimiro Díaz Toledano OSA (1693–1746) was a Spanish Augustinian friar who accompanied the first Spanish expedition to the Cordillera, situated on the island of Luzon in the Philippines. Díaz wrote Conquistas de las Islas Philipinas in 1718 (published in Valladolid in 1890). He also wrote Parrocho (1745). Casimiro Díaz reported, "The Igorots are a barbaric people."