Ministerial by-election
From 1708 to 1926, members of parliament (MPs) of the House of Commons of Great Britain (and later the United Kingdom) automatically vacated their seats when made ministers in government and had to successfully contest a by-election in order to rejoin the House; such ministerial by-elections were imported into the constitutions of several colonies of the British Empire, where they were likewise all abolished by the mid-20th century. The requirement of MPs to rejoin the House upon ministerial appointment arose from 17th-century ideas of the independence of the House from the influence of the Crown, which appoints the ministers.