The Parliament of the United Kingdom of Great Britain and Northern Ireland is the highest political-legislative and legislative body in the United Kingdom and British overseas territories. It alone has parliamentary sovereignty over all other political bodies. The parliament has an upper house, the House of Lords, and a lower house, the House of Commons. At its head is the monarch, King Charles III. The monarch is the third part of Parliament. The British people choose the people in the lower house (members of parliament) in elections.