Galdós first gained fame with the "Episodios Nacionales," a monumental series of historical novels dramatizing nineteenth-century Spain from the Peninsular War onward. His contemporary realist novels dissect Spanish society with irony and compassion, exploring religion, class, and politics. Major works include Doña Perfecta (1876), Marianela (1878), La de Bringas (1884), Miau (1888), Tristana (1892), Misericordia (1897), and his masterpiece Fortunata y Jacinta (1886–87), a vast panorama of Madrid society often compared to the novels of Dickens and Balzac.
He also achieved success as a playwright with works such as Realidad (1892) and Electra (1901). Elected to the Royal Spanish Academy in 1897, Galdós was repeatedly nominated for the Nobel Prize in Literature. Despite going deaf in his final years, he continued writing, leaving an enduring legacy that shaped modern Spanish literature.