Laocoön by El Greco https://www.nga.gov/artworks/33253-laocoon
During the Trojan War, the priest Laocoön angered the Greek gods, who sent snakes to kill him and his two sons. The legend became popular after a monumental, ancient marble sculpture of Laocoön and his sons was unearthed in Rome in 1506.
Mann. Spanish Paintings of the Fifteenth through Nineteenth Centuries.