Oath of allegiance

An oath of allegiance is an oath whereby a subject or citizen acknowledges a duty of allegiance and swears loyalty to monarch or country. In republics, modern oaths specify allegiance to the country in general, or to the country's constitution. For example, officials in the United States, a republic, take an oath of office that includes swearing allegiance to the United States Constitution. However, in a constitutional monarchy, such as in the United Kingdom, Australia and other Commonwealth realms, oaths are sworn to the monarch.