D. Hernán Núñez Arnalte, treasurer and secretary of the Catholic Monarchs, is the founder of the oldest part of the monastery. But died before starting your project, and left a will in which he asked Fr Torquemada and Dona Maria Davila to continue their work, building a convent dedicated to St. Thomas Aquinas
The construction began on April 11, 1482 under the leadership of Martin de Solorzano. He built the cloister of the novitiate which it could be a convent itself