Wikipedia
Las Soledades (Solitudes) is a poem by Luis de Góngora, composed in 1613 in silva (Spanish strophe) in eleven- and seven- syllable lines: hendecasyllables (endecasílabos) and heptasyllables (heptasílabos).
Góngora intended to divide the poem in four parts that were to be called "Soledad de los campos" (Solitude of the fields), "Soledad de las riberas" (Solitude of the riverbanks), "Soledad de las selvas" (Solitude of the forests), and "Soledad del yermo" (Solitude of the wasteland).
However, Góngora only wrote the "dedicatoria al Duque de Béjar" (dedication to the Duke of Béjar) and the first two Soledades, the second of which remained unfinished.
From the time of their composition, Soledades inspired a great debate regarding the difficulty of its language and its mythological and erudite references. It was attacked by the Count of Salinas and Juan Martínez de Jáuregui y Aguilar (who composed an Antidote against the Soledades). The work, however, was defended by Salcedo Coronel, José Pellicer, Francisco Fernández de Córdoba (Abad de Rute), the Count of Villamediana, Gabriel Bocángel, and overseas, Juan de Espinosa Medrano y Sor Juana Inés de la Cruz.
Rafael Alberti would later add his own Soledad tercera (Paráfrasis incompleta)
The first novel of John Crowley's Aegypt Sequence is named The Solitudes and the Góngora poem is read by the protagonist, and is referenced throughout the plot.