St Helena is an internally, self-governing Overseas Territory of the United Kingdom. It forms part of a group comprising of St Helena itself, along with Ascension Island and the Tristan da Cunha group of islands. Executive authority of this group is invested in Queen Elizabeth II and is exercised on her behalf by the governor of St Helena. The Governor is appointed by the Queen on the advice of the British government. Defence and foreign affairs remain the responsibility of the United Kingdom. St Helena has its own legislature. There are fifteen seats in the Legislative Council of St Helena, a unicameral legislature. Twelve of the fifteen members are elected in elections held every four years. The other three members are the Chief Secretary, Financial Secretary and the Attorney General.