Ferdinand III dari Castile itu apa sih? Jelaskan dalam bahasa melayu ya

|venerated_in= Gereja Katolik Rom(Third Order of St. Francis)

|image=Fernando III el Santo, rey de Castilla y León.jpg

|patronage=University of Salamanca; Katedral Burgos; Katedral Sevilla; Katedral La Laguna; Diocese of San Cristobal de La Laguna; Universiti La Laguna; of friars: (Dominican, Franciscan, Trinitarian, and Mercedarian);Lucena City, Quezon; San Fernando, California; City of San Fernando, Pampanga; Liloan, Cebu; Metropolitan Cathedral of San Fernando; (Cathedral of Resistencia, Argentina);San Fernando de Dilao Church (Pro-Cathedral of San Fernando de Dilao, Paco, Manila); of engineers