 The winning design, by Santiago Otalba Hernández, was a sculptural group comprising images of the Immaculate Conception and two angels holding the royal arms, along with a cross of dark granite with bronze embellishments.However, the project failed to materialize, with the resignation of the artist.It took more than a decade to achieve the current monument, designed by Madrilenian sculptor Federico Coullaut-Valera and completed in 1963.