‘In the UK and Commonwealth, an oath of allegiance is a promise to be loyal to the monarch, their heirs and successors. Also known as ‘swearing in’, it is pledged in various contexts, including at the beginning of a Parliament and when government ministers assume office. The allegiance is pledged to the monarch as the personification of the Crown – the symbol of British state authority.’
UK Constitutional Law Association, 17th September 2025
Source: ukconstitutionallaw.org
