The "Asociación de Ex Alumnos del Colegio de San Ildefonso" has gathered a great variety of documents of great historical value over the years; for example a dedicatory from the beginning of the XX century written by Alfonso XX and Maria Cristina, king and queen of Spain.

Other documents and objects are of a great sentimental value like the Association's first administrative documents from 1922 or an interesting collection of membership cards, information leaflets, corporate cards, etc. Through these documents we can make an interesting trip through our history.