In our article we try to approximate to the theme of spanish existencialism and the views of Miguel de Unamuno in particular. Evaluating the reasons of philosophizing and revising the relation between phylosophy and literature, we investigate the origins of romantic existencialism (of Soren Kierkegaard) and literary pre-existencialism (of Gustavo Adolfo Becquer) which has the precursor function of phylosophical existencialism cultivated in Unamuno's literary and documentary texts.