Castro died in Havana on Friday at 10:29pm local time, Cuban television said. His death was announced by his brother Raul, who took the reins after Fidel stepped down.
His passing marks the end of an era for many. Castro was the last remaining leader from the group of old school communist leaders including Chinese Mao Zedong, Korean Kim Il-sung and Soviets Nikita Khrushchev and Leonid Brezhnev.
Dictator or national hero, Castro was called many things along the way, as he rose from being a student activist protesting against oppressive regimes to becoming the president of Cuba.
In February 1959, the Cuban Revolution brought Castro to power as the prime minister. He was backed by the so-called 26th of July Movement, and Latin American revolutionary Che Guevara. Together, they managed to oust US-backed President Batista.