Basque-Spanish philosopher, novelist, essayist, and poet — the most important Spanish thinker of the early 20th century and one of the bridges between Kierkegaard and the French existentialists who would come after. Rector of the University of Salamanca (where his confrontation with the Francoist general Millán-Astray in October 1936 — "Venceréis, pero no convenceréis": you will conquer, but you will not convince — is among the great acts of academic courage), Unamuno was a central figure of the "Generation of '98" that tried to reckon with the collapse of the Spanish Empire and the meaning of Spain as a modern nation.
The Tragic Sense of Life (Del sentimiento trágico de la vida, 1913) is his major philosophical work: a sustained meditation on the human being as a creature who will not accept his mortality, who needs — not merely desires — the immortality reason cannot give, and who therefore lives in a permanent tension between the rational mind that denies eternal life and the "man of flesh and bone" who demands it. The resolution, for Unamuno, is not a leap to faith (as in Kierkegaard) nor a Camusian revolt but a perpetual agonía — struggle — which is itself the mark of authentic existence. The Agony of Christianity (1925) extended the argument into explicit theological territory.
His novellas — Mist (Niebla, 1914), in which a character confronts his author about his existence; Abel Sánchez (1917), a modern retelling of Cain and Abel; Saint Manuel Bueno, Martyr (1930), about a village priest who has lost his faith but preserves his people's — are, in different ways, philosophical fiction of an order few Spanish-language writers have matched. He was exiled under the Primo de Rivera dictatorship (1924–30), celebrated on his return, and died under house arrest in Salamanca shortly after his public humiliation of Millán-Astray.