HAVANA- Cuba's ruling Communist Party elected President Miguel Diaz-Canel to succeed Raul Castro as party first secretary, the most powerful position in the country, on the final day of its congress on Monday, state-run news agency Prensa Latina reported.

The succession marks the end of six decades of rule by brothers Fidel and Raul Castro, who led Cuba's leftist 1959 revolution, in a transition to a younger leadership.

(Reporting by Sarah Marsh and Nelson Acosta) ((sarah.marsh@thomsonreuters.com; +53 5217 0928; Reuters Messaging: sarah.marsh.thomsonreuters.com@reuters.net))