"History will judge the enormous impact" of Cuba's former leader Fidel Castro on the world, US President Barack Obama has said.
The death of Castro, one of the world's longest-serving leaders, was announced by his brother Raul on Friday night.
Castro came to power in 1959, and ushered in a Communist revolution. He defied the US for decades, surviving many assassination plots.
He ruled Cuba as a one party state for almost half a century.
As communist regimes collapsed across the world, Castro kept the red flag flying right on the doorstep of his greatest enemy, the United States.
A divisive figure his supporters praised him as a champion of socialism, the soldier-politician who had given Cuba back to the people, but critics called him a dictator.