 Gramsci was one of the most important Marxist thinkers of the 20th century, and a particularly key thinker in the development of Western Marxism.He wrote more than 30 notebooks and 3,000 pages of history and analysis during his imprisonment.These writings, known as the "Prison Notebooks", contain Gramsci's tracing of Italian history and nationalism, as well as some ideas in Marxist theory, critical theory and educational theory associated with his name, such as