In July 1943, after the Allied Forces successfully hit Italy and then occupied Sicily, King Vittorio Emanuele III, along with the Italian National Fascist Council resigned and captured Mussolini. After Mussolini was overthrown, King Emanuele III then discussed a ceasefire with the Allies. When the ceasefire was agreed by both sides, Nazi Germany quickly invaded northern Italy and freed Mussolini from prison and founded the Italian Social Republic (RSI). The RSI proclaimed independence on 23 September 1943 and claimed its territory was the entire old mainland of Italy. This state was supported by the Republican Fascism Party. By law, the capital of the Italian Social Republic is Rome, but the de facto, the central of the government was in Salò.