This picture is of Raul Modesto Castro Ruz. Castro came into power after his brother Fidel Castro. Raul was a Cuban politician and revolutionary who was a rebel commander during the 1950s and he was eventually the President of the Council of State of Cuba, and also was the President of the Council of Ministers of Cuba. So based of this, Castro came into power because of his reputation and his acquaintance with the previous president, his brother.