This essay describes the advocacy of Archbishop Antonio J. Ledesma, currently the co-president of Pax Christi Philippines and archbishop emeritus of the archdiocese of Cagayan de Oro, Mindanao, Philippines, towards peace and development not only in Mindanao but also throughout the country. He is a strong proponent of interreligious dialogue and the importance of addressing the roots of the armed conflict so there can be an enduring peace in the Philippines and beyond.