Aimé Césaire was a Martinican poet, playwright, and politician who is best known for his role in the Negritude literary movement, which celebrated Black culture and identity. His work, particularly the poem 'Cahier d'un retour au pays natal' (Notebook of a Return to My Native Land), reflects themes of colonialism, cultural pride, and the struggles of decolonization, connecting deeply with the processes that led to independence movements in the mid-20th century.