Īs a young medical student, Guevara traveled throughout South America and was radicalized by the poverty, hunger, and disease he witnessed. A major figure of the Cuban Revolution, his stylized visage has become a ubiquitous countercultural symbol of rebellion and global insignia in popular culture. Ernesto ' Che' Guevara ( Spanish: 14 June 1928 – 9 October 1967) was an Argentine Marxist revolutionary, physician, author, guerrilla leader, diplomat, and military theorist.