The revolutionary leader who declared Cuban independence from Spain was José Martí. He played a crucial role in the Cuban Liberation movement by advocating for the rights and freedoms of Cubans. Martí's writings and activism inspired his fellow countrymen to rise against colonial oppression. He became a symbol of national identity and pride, fostering unity among the varied factions seeking independence. His efforts laid the groundwork for the eventual success of the Cuban Revolution, making him an enduring figure in Latin American history.