Pedro Calderon de la Barca y Barreda Gonzalez de Henao Ruiz de Blasco y Riaño, usually referred as Pedro Calderón de la Barca, was a dramatist, poet and writer of the Spanish Golden Age. During certain periods of his life he was also a soldier and a Roman Catholic priest. Born when the Spanish Golden Age theatre was being defined by Lope de Vega, he developed it further, his work being regarded as the culmination of the Spanish Baroque theatre. As such, he is regarded as one of Spain's foremost dramatists and one of the finest playwrights of world literature. Life Is a Dream is a Spanish-language play by Pedro Calderon de la Barca. First published in 1635, it is a philosophical allegory regarding the human situation and the mystery of life. Focusing on Segismundo, Prince of Poland, the central argument is the conflict between free will and fate. The play remains one of Calderon's best-known and most studied works. It has been described as "the supreme example of Spanish Golden Age drama".