who exercise the actual executive power under the parliamentary form of government
Prime minister The prime minister is often, but not always, a member of the Legislature or the Lower House thereof and is expected with other ministers to ensure the passage of bills through the legislature. In some monarchies the monarch may also exercise executive powers (known as the royal prerogative) that are constitutionally vested in the crown and may be exercised without the approval of parliament.
Politics of Italy The executive power is exercised collectively by the Council of Ministers, which is led by the Prime Minister, officially referred to as President of the Council (Presidente del Consiglio). Legislative power is vested in the two houses of the Italian Parliament primarily, and secondarily on the Council of Ministers, which can introduce bills and holds the majority in both houses. The judiciary of Italy is independent of the executive and the legislative branches. It is headed by the High Council of the Judiciary, a body presided over by the President of Italy, who is the head of state though his position is separate from all branches. The current Italian President is Sergio Mattarella and the current Prime Minister of Italy is Paolo Gentiloni.